tutorial - How to set Cron/At Access Control

Cron stores it's enteries in the crontab (cron table) file. This is generally located in your /etc directory. As well, each user on your system can have their own crontab which would be stored in /var/spool/cron/. To edit a users crontab entry, simply log into your system for that particular user and type crontab -e. The default editor for the 'crontab -e' command is vi. Below is the simple example of crontab entry

0 12  *  *  *  root  php /srv/www/mysar/dump.php >> /dev/null 2>&1

FieldMeaning
1Minute (0-59)
2Hour (2-24)
3Day of month (1-31)
4Month (1-12, Jan, Feb, etc)
5Day of week (0-6) 0 = Sunday, 1 = Monday etc or Sun, Mon, etc)
6Run the command as following user
7Command to execute

Now to control the access to crontab for particular user you need to edit the required configuration file depending upon your requirement, which are mentioned below.

1.  /etc/cron.allow
      If it exists, a user must be listed in this file in order to use crontab.

2. /etc/cron.deny
      If it exists, a user must not be listed in this file in order to user crontab.

Similary for "at" access control, you can edit the following files depending upon your requirement

1. /etc/at.allow
      Same as cron.allow, only for "at".

2. /etc/at.deny
      Same as cron.deny, only for "at".


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/05/135781757116740.html

tutorial - Fighting Spam mails

Spam is flooding the Internet with many copies of the same message, in an attempt to force the message on people who would not otherwise choose to receive it. Most spam is commercial advertising, often for dubious products, get-rich-quick schemes, or quasi-legal services. Spam costs the sender very little to send -- most of the costs are paid for by the recipient or the carriers rather than by the sender.

Spammers get your e-mail addresses from webpages, news groups or domain records (if you have your own domain). There are individuals who use robots to extract the addresses, burn them on CDs and sell them very cheap to other Spammers. If you write your e-mail address in clear text onto your homepage today such that programs can extract it, then you will have a major problem in a few months time and you can't stop it. The problem will be growing every day!

Now lets discuss some common filter techniques and how they work. I will not describe how to configure them exactly in each MTA. Instead I suggest you to read the documentation that comes with the MTA that you have installed. Postfix and Exim are well documented

Realtime Block lists:
These are DNS based lists. You check the IP address of the mailserver that wants to send mail to your server against a blacklist of known spammers. Common lists are www.spamhaus.org.  You should however not be too enthusiastic about it and carefully choose the lists since there are also some which block entire IP ranges simply because one spammer had used a dialup connection from this ISP at one point in time.

8 bit characters in subject line:
About 30% of the spam origins in China, Taiwan or other Asian countries these days. If you are sure that you can't read Chinese then you can reject mail which has a lot of 8 bit characters (not ASCII) in the subject. Some MTAs have a separate configuration option for this but you can also use regular expression matching on the header:

      /^Subject:.*[^ -~][^ -~][^ -~][^ -~]/

This will reject email which has more than 4 consecutive characters in the subject line which are not in the ASCII range space to tilde. Both exim and postfix can be compiled with perl regular expression support. This method is quite good and keeps out 20-30% of the spam-mail.

Lists with "From" addresses of known spammers:
Forget it. This used to work back in 1997. Spammers today use faked addresses or addresses of innocent people.

Reject non FQDN (Fully Qualified Domain Name) sender and unknown sender domain:
Some spammers use non existent addresses in the "From". It is not possible to check the complete address but you can check the hostname/domain part of it by querying a DNS server.
This keeps out about 10-15% of the spam and you don't want these mails anyhow because you would not be able to reply to them even if they were not spam.

IP address has no PTR record in the DNS:
This checks that the IP address from where you get the mail can be reverse resolved into a domain name. This is a very powerful option and keeps out a lot of mail. I would not recommend it! This does not test if the system administrator of the mail server is good but if he has a good backbone provider. ISPs buy IP addresses from their backbone providers and they buy from bigger backbone providers. All involved backbone providers and ISPs have to configure their DNS correctly to make the whole chain work. If somebody in between makes a mistake or does not want to configure it then it does not work. It says nothing about the individual mail server at the end of the chain.

Require HELO command:
When 2 MTAs (mail servers) talk to each other (via smtp) then they first say who they are. Some spam software does not do that. This keeps out 1-5% of the spam.

Require HELO command and reject unknown servers:
You take the name that you get in the HELO command and then you go to DNS and check if this is a correctly registered server. This is very good because a spammer who uses just a temporary dialup connection will usually not configure a valid DNS record for it.
This blocks about 70-80% of all spam but rejects also legitimate mail which comes from sites with multiple mail servers where a sloppy system administrator forgot to put the hostnames of all servers into DNS.

Some MTAs have even more options but the above are quite commonly available in a good MTA. The advantage of all those checks is that they are not CPU intensive. You will usually not need to update your mailserver hardware if you use those checks. 


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/05/135781757118705.html

tutorial - (R)ecovery (I)s (P)ossible Linux rescue system

Recovery Is Possible (RIP) is a Slackware-based CD boot/rescue/backup/maintenance system. It has support for a lot of filesystem types (Reiserfs, Reiser4, ext2/3, iso9660, UDF, XFS, JFS, UFS, HPFS, HFS, MINIX, MS DOS, NTFS, and VFAT) and contains a bunch of utilities for system recovery. It also has IDE/SCSI/SATA, PCMCIA, RAID, LVM2, and Ethernet/DSL/cable/PPP/PPPOE network support.

RIPLinux come with lots of tools:

    * Programas like fetchmail , curl, wget, ssh/sshd, mutt, links, msmtp, tmsnc, slrn, lftp, Firefox
    * Includes packages like cdrwtool, mkudffs and pktsetup for writing backups & files to optical media.
    * system monitoring: lshw, atop, htop, dmesg, dmidecode, mount utility (of course, these tools come with most of the Linux distros today but they could be useful to detect I/O errors, BIOS warnings, damaged partitions)
    * partitioning: fdisk, cfdisk, Ghost For Linux, GParted, Grub, Partimage, Testdisk (the list of supported partition types includes EXT4, Reiser4 and NTFS)
    * fsck.reiserfs and 'fsck.reiser4 to check and repair filesystem ReiserFS and Reiser4.
    * xfs_repair to repair a Linux file system xfs.
    * jfs_fsck to check and repair a Linux file system JFS.
    * e2fsck to check and repair a Linux file system ext2 or ext3.
    * ntfsresize for resizing the Windows NTFS without losing data.
    * ntfs-3g to write to Windows NTFS.
    * chntpw can view information and user passwords on Windows systems.
    * cmospwd allows you to retrieve password from CMOS / BIOS.


Download bootable ISO - here



Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/05/13578175713486.html

tutorial - Download/Upload files from torrents/Rapidshare or Videos from Youtube using FatRat download manager

FatRat is an open source download manager for Linux written in C++ and built on top of the Trolltech Qt 4 library. It is rich in features and is continuously extended.

Features:
    * HTTP(S)/FTP/ downloads
    * FTP uploads
    * RSS feed support + special functions for TV shows and podcasts
    * BitTorrent support (including torrent creating, DHT, UPnP, encryption etc.)
    * Torrent search
    * Support for SOCKS5 and HTTP proxies
    * RapidShare.com FREE downloads
    * RapidShare.com uploads
    * RapidShare.com link verification and folder extraction
    * RapidSafe link decoding
    * MD4/MD5/SHA1 hash computing
    * Remote control via Jabber (!)
    * Remote control via a web interface
    * YouTube video downloading

Installation: Use "1-click" installer to install Fatrat
OpenSuSe 11.1 - here

After sucessfull installation go to: Start >> Application >> Internet >> Data Exchange and start fatrat
 
The graphical interface is very organized and allows you to easily perform the most varied tasks, divided into tabs. FatRat is also very configurable, both in terms of downloading/uploading files, Torent and others. It also got some beautiful graphs which provide the detail view of upload/download speeds ...


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/05/135781757114798.html

tutorial - Next Generation of the Fastest P2P Program - FrostWire (OpenSuSe)

FrostWire is a peer-to-peer file sharing program for the Gnutella and BitTorrent protocols. FrostWire is written in Java, and is a fork of LimeWire, another popular Gnutella client. Released under the GNU General Public License, FrostWire is free software.

Features:

    * As with LimeWire, FrostWire is written in Java, and is therefore capable of supporting multiple platforms.
    * While LimeWire is available in both free and paid versions, FrostWire is released only as a free version, the Windows version of which comes bundled with the Ask.com toolbar. FrostWire includes much of the functionality of LimeWire's free version, as well as a few of LimeWire Pro's payment based upgrades.
    * FrostWire provides a chatroom, which is absent in LimeWire. However, LimeWire includes an instant messenger using the Jabber protocol and allows the user to share with individual friends in the messenger which is a feature not found in FrostWire. Starting from version 4.13.1.7, the chat feature of displays advertising to help pay for the required servers.[1]
    * FrostWire's interface was originally nearly identical to that of LimeWire. However, LimeWire 5.0 has a re-designed interface which has not been implemented by FrostWire. FrostWire's skin may be changed to a variety of different colors which is no longer an option in LimeWire 5.0.


Installation:
1) Download FrostWire (tar) - here
2) After sucessfull download, untar the package: tar -zxvf frostwire-4.18.0.noarch.tar.gz
3) Go inside the directory and run command: ./runFrostwire.sh to start the installation process

4) Configure your share folder location


Finally, after few more screens you should able to complete the installation to lunch the application



Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/05/135781757112416.html

tutorial - Reducing load on web server by using reverse proxy - squid

Many large organizations use caching proxy servers to save on network bandwidth utilization (and costs) and improve browsing response times. In fact, an entire industry has grown up around caching proxy appliances. But in the open source world, we’ve had one of the most advanced proxy servers for many, many years. Squid (http://www.squid-cache.org) is to caching proxy servers as Apache is to web servers.

A quick-win method of reducing load on a Web site is to use a reverse proxy, which intercepts requests from clients and then proxies those requests on to the Web server, caching the response itself as it sends it back to the client.

This is useful because it means that for static content the proxy doesn't have to always contact the Web server, but can often serve the request from its own local cache. This in turn reduces the load on the Web server. This is especially the case when the Web server also serves dynamic content, since the Web server hardware can be less tuned to static content (when it is cached by a front-end proxy) and more tuned to serving dynamic content. It is also sometimes the case that although the Web server is serving dynamically created pages, these pages are cachable for a few seconds or maybe a few minutes. By using a reverse proxy, the serving of these pages speeds up dramatically.

Reverse proxying in this manner can also be used alongside the simple load balancing system, where static and dynamic content are split across separate servers. Obviously the proxy would be used on only the static content Web server.

Squid Configuration for Reverse Proxy:
The reverse proxy has to intercept every request, in order to compare it with its cache content. Let's assume we have two machines:

    * Web server serving http://www.example.net/ (192.168.0.1)
    * squid.example.net (192.168.0.2)

In squid.conf file we begin with the IP addresses, and tell it to listen for incoming requests on port 80.
http_port       192.168.0.2:80 vhost vport
http_port       127.0.0.1:80
icp_port        0
cache_peer      192.168.0.1 parent 80 0 originserver default
A reverse proxy for a public Web server has to answer requests for everybody so we need to add some ACL.
acl         all src 0.0.0.0/0.0.0.0
acl         manager proto cache_object
acl         localhost src 127.0.0.1/255.255.255.255
acl         reverseproxy dst 192.168.0.1 192.168.0.2
http_access allow reverseproxy
http_access allow manager localhost
http_access deny manager
http_access deny all
deny_info   http://www.example.net/ all
You can change your configuration as per your needs.


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/05/13578175716383.html

tutorial - Philosophy of free software (Video) by Richard Stallman

 
Download video of Richard Stallman in 2009  FLISOL - here
The video lasts 28 minutes and this format ogv (free technology for video compression)


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/05/135781757112174.html

tutorial - Secure alternative to telnet

Telnet is a protocol allowing you to connect to a remote system and run programs and commands on that system. It is very old and still very much in use today.

Unfortunately, Telnet, by default, does not encrypt any data sent over the connection (including passwords), and so it is often practical to eavesdrop on the communications and use the password later for malicious purposes; anybody who has access to a router, switch, hub or gateway located on the network between the two hosts where Telnet is being used can intercept the packets passing by and obtain login and password information (and whatever else is typed) with any of several common utilities like tcpdump and Wireshark.

On the other hand, a program called ssh exists that can replace both telnet and ftp in a secure, encrypted way.

Ssh stands for Secure Shell. It will encrypt each connection with a random key, so that it is impossible or at least very hard for a third party to decrypt the connection and find the password, or spy on you.

Use putty (Here)  if you are on windows or use "ssh" command (example shown below) from Linux/UNIX box to connect to the remote server.

# ssh 192.168.0.2
The authenticity of host '192.168.0.2 (192.168.0.2)' can't be established.
RSA key fingerprint is 2b:91:9b:c1:a7:57:91:dc:93:b3:04:50:c0:b9:bd:ba.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.2' (RSA) to the list of known hosts.
Password:


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/06/13578175717786.html

tutorial - Setting the SUID/SGID bits

SetUID bit, the executable which has the SUID set runs with the ownership of the program owner. That is, if you own an executable, and another person issues the executable, then it runs with your permission and not his. The default is that a program runs with the ownership of the person executing the binary.

The SGID bit is the same as of SUID, only the case is that it runs with the permission of the group. Another use is it can be set on folders,making files or folders created inside the SGID set folder to have a common group ownership.

Note : Making SUID and SGID programs completely safe is very difficult (or maybe impossible) thus in case you are a system administrator it is best to consult some professionals before giving access rights to root owned applications by setting the SUID bit. As a home user (where you are both the normal user and the superuser) the SUID bit helps you do a lot of things easily without having to log in as the superuser every now and then

Setting SUID bits on the file:
Suppose I got the executable called "killprocess" and I need to set the suid bit on this file, go to command prompt and issue command: chmod u+s killprocess

Now check permission on the file with command ls -l killprocess, observe "s" that has been added for suid bit

-rwsr-xr-x 1 root root 6 Jun  7 12:16 killprocess

Setting GUID bits on the file:
go to command prompt and issue command: chmod g+s killprocess
This will set the GUID bit on the same file, check the permission on this file using command: ls -l killprocess
 
-rwsr-sr-x 1 root root 6 Jun  7 12:16 killprocess


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/06/135781757112460.html

tutorial - OpenSUSE 11.1: Documentations

openSUSE 11.1 provides all the tools and resources you need for effective home computing and computing on the go. It includes a complete, intuitive Linux desktop with a Web browser, instant messenger, e-mail client, photo catalog, word processor, spreadsheet, graphics tools, multimedia software, games and more. Its office suite is 100-percent compatible with Microsoft Office, and it also features the latest software for home networking, wireless support, Web hosting, virtualization, application security and software development.

Getting Started:
    * openSUSE 11.1 Start-Up
    * KDE Quick Start
    * GNOME Quick Start

User Guides:
    * KDE User Guide
    * GNOME User Guide

Administration:
    * openSUSE 11.1 Reference Guide
    * Security Guide
    * AppArmor 2.3.1 Quick Start


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/06/135781757113522.html

tutorial - How to list Open Files and Network Connections

Lsof is a Unix-specific diagnostic tool. Its name stands for LiSt Open Files, and it does just that. It lists information about any files that are open by processes currently running on the system. It can also list communications open by each process.

One evident advantage this capability is security. For example, if a spyware or other malware program was sending information from your computer to the Internet or to a file on your hard disk, it would show up in the output of these commands.

lsof – list open files
This simple command often ran with no arguments, and does just what it says: lists every single open file by every program running at the time. The output of lsof typically looks like this:

 
In this case the output is too large, so the better way to redirect the output to some file for further analysis, use this command to redirect the output: lsof > output.txt and or filter it using various pipe commands.
Another example, if one wants to see if the special file (application) firefox is open by any processes, we run the following command: lsof | grep /usr/lib/firefox/firefox

list open network sockets (connections)
In addition to listing open files, lsof can list open network sockets (connections) when given the -i switch.

  
If you observe the output you can see the list of open connections made by different process/application to/from you local box


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/06/135781757114546.html

tutorial - Linux Market Share Passes 2%

W3Counter.com just releasted their April market share stats and linux passed 2.16% for the first time ever.

 


Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/06/135781757117791.html

tutorial - Increasing Bugzilla attachment size & saving large attachment on filesystem

By default Bugzilla sets the maximum size of attachments and patches to 1 MB.
In order to increase this you need to make a change to both Bugzilla and MySQL

Change the maxattachmentsize parameters in Bugzilla
In Admin login, go to "Parameters" >>  Attachments >> maxattachmentsize, here you can change the Attachment Size as your wish as shown in the screenshot below



Change the size of allowed allowed packets in MySQL
Go to your the max_allowed_packet setting in your mysql my.cnf file:

set-variable=max_allowed_packet=4M

Saving attachment to filesystem:
The value of parameter "maxattachmentsize" will allow the user to save the attachment into mysql DB and anything above this value and less than the value specified in parameter "maxlocalattachment", bugzill will save the attachment on the filesystem, so adjust the parameter as per your need.

Now if user want to attach the file having size more than the value specified in "maxattachmentsize" parameter, user need to enable the "BigFile" option while adding the attachment, in this case system will save this file on filesystem under bugzilla installation folder "/data/attachment"



Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration

source:http://linuxpoison.blogspot.com/2009/06/13578175712560.html

Labels

Web Search Gmail Google Docs Mobile YouTube Google Maps Google Chrome User interface Tips iGoogle Social Google Reader Traffic Making Devices cpp programming Ads Image Search Google Calendar tips dan trik Google Video Google Translate web programming Picasa Web Albums Blogger Google News Google Earth Yahoo Android Google Talk Google Plus Greasemonkey Security software download info Firefox extensions Google Toolbar Software OneBox Google Apps Google Suggest SEO Traffic tips Book Search API Acquisitions InOut Visualization Web Design Method for Getting Ultimate Traffic Webmasters Google Desktop How to Blogging Music Nostalgia orkut Google Chrome OS Google Contacts Google Notebook SQL programming Google Local Make Money Windows Live GDrive Google Gears April Fools Day Google Analytics Google Co-op visual basic Knowledge java programming Google Checkout Google Instant Google Bookmarks Google Phone Google Trends Web History mp3 download Easter Egg Google Profiles Blog Search Google Buzz Google Services Site Map for Ur Site game download games trick Google Pack Spam cerita hidup Picasa Product's Marketing Universal Search FeedBurner Google Groups Month in review Twitter Traffic AJAX Search Google Dictionary Google Sites Google Update Page Creator Game Google Finance Google Goggles Google Music file download Annoyances Froogle Google Base Google Latitude Google Voice Google Wave Google Health Google Scholar PlusBox SearchMash teknologi unik video download windows Facebook Traffic Social Media Marketing Yahoo Pipes Google Play Google Promos Google TV SketchUp WEB Domain WWW World Wide Service chord Improve Adsence Earning jurnalistik sistem operasi AdWords Traffic App Designing Tips and Tricks WEB Hosting linux How to Get Hosting Linux Kernel WEB Errors Writing Content award business communication ubuntu unik