Month: June 2009

Get a free shell account online

GET A FREE SHELL ACCOUNT ONLINE.A shell is an utility from where you can access Linux/*Nix servers from any where and execute the commands/scripts etc. This post is for the users who are new to linux/Nix and want to feel/work on the Linux with out installing on the system. ““ is free online BSD(Berkeley Software Distribution) server where you can request a shell account and explore your self. There are so many free shell providers on net but most of the servers/service providers will not give you free account simply, you have to prove your self to them that you are not a spamer and you are really in need of shell account to explore Unix. Here are some advantages: No need to install any unix systems. Good for beginers. Some disadvantages: You can work on only limited commands provided by the system administrator. Require any SSH clients(such as Putty) and internet connection. Here are the links from where you can get your free Shell accounts (I personally used their service and its preaty good) Please comment on this so that I can improve the blog quality. Please visit for more linux admin...

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DISTRO’S.This is my first post on Distro’s. To discuss about Distributions, there is lots and lots of information about them which is beyond this blog. But I will try to cover as much good and best distros in the market on weekly basis. To start with.. what is a Distro actually?A “Linux distribution” (also called GNU/Linux distribution by some vendors and users) is a member of the family of Unix-like software distributions built on top of the Linux kernel. A distro some times refferd as “Distribution” or “Flavor“. For General public purpose(like Ubuntu & Fedora). For Corporate purpose(like Cisco Linux & Oracle Linux). For Regionality purpose(like swecha Linux for People whose mother tongue is Telugu). For Basic routing purpose(like Linux router project). A distro is nothing but linux kernel(in general it is considerd as core of operating system)+Applications(such as mail clients,servers, browsers office suite etc). Suppose if we say Redhat linux it is equal to Linux kernel developed by linus torvalds + Applications developed by Redhat people.For your information here are some details about Distro.There are more than 500 Distro’s in Linux followed by Unix with 150 flavors then with Windows around 50Please keep an eye on this session to see coming Distro’s. Please visit for more linux admin...

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10 Commandments !! U like it for sure!!

This is a guest post by Praveen 10 COMMANDMENTS !! U LIKE IT FOR SURE !! =>1 People are illogical, unreasonable, and self-centered. Love them anyway. =>2 If you do good, people will accuse you of selfish, ulterior motives. Do good anyway. =>3 If you are successful, you will win false friends and true enemies. Succeed anyway.=>4 The good you do today, will be forgotten tomorrow. Do good anyway.=>5 Honesty and frankness make you vulnerable. Be honest and frank anyway. =>6 The smallest men and women with the smallest minds can shoot down the biggest men and women with the biggest ideas. Think big anyway.=>7 People favor underdogs, but follow only top dogs. Fight for a few underdogs anyway. =>8 What you spend years building may be destroyed overnight. Build anyway.=>9 People really need help, but may attack you if you do help them. Help people anyway. =>10 Give the world the best you have and you’ll get kicked in the teeth. Give the world the best you have anyway. Please visit for more linux admin...

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Linux User info gathering commands

MONITORING USERS User-management is always one of the basic tasks for Linux administrators, here we are going to see some basics user related “Monitoring Commands”. 1) “finger” is a command which will give full details about user properties such as name, login, shell what he is using etc. Syntax: #finger username Example: [[email protected] ~]# finger root Login: root Name: root Directory: /root Shell: /bin/bash On since Sat Jun 6 19:20 (EDT) on tty1 4 hours 12 minutes idle On since Sun Jun 7 02:18 (EDT) on pts/0 from :0.0 On since Sun Jun 7 03:48 (EDT) on pts/1 from :0.0 16 minutes 9 seconds idle New mail received Sun Jun 7 04:02 2009 (EDT) Unread since Sat Jun 6 22:17 2009 (EDT) No Plan. Here you can see so many user related information one security information you can see is when he loged in last time and from where he loged in etc. 2)“id” is one more command which will show the user details such as his primary group and his secondary group. Syntax: #id username Example: [[email protected] ~]# id root uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=root:system_r:unconfined_t:SystemLow–SystemHigh [[email protected] ~]# 3)“chage“ is one more command which is used to see user related “threshold details” such as user disable time etc. Syntax: #chage -l username Example: [[email protected] ~]# chage -l root Last password change : Jun 06, 2009 Password expires : never Password...

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So what is the difference between RAID01 and RAID10? This is bit tricky question, Recently I came to know about this one in an interview. so do both are same? No both are not same. When we are dealing with RAID01 we are actually implementing RAID0 first then RAID1 on it. Ok little bit confused? Let me put it in this way RAID0 is nothing but stripeset writing of data and RAID1 is Mirring of data on to disks.For example lets take 8 disks, so first we are writing whole data on 4 disks then we are mirring it on to remaining disks. Where as in RAID10 we are first mirring disk and then striping data on mirrered disks In general RAID01 is “a mirrior of 2 strips” and RIAD10 is “a single strip on mirrered disks” So here one more question arises… which one is good? RAID10 is good, the difference is that the chance of system failure with two drive failures in a RAID 0+1 system with two sets of drives is (n/2)/(n – 1) where “n” is the total number of drives in the system. The chance of system failure in a RAID 1+0 system with two drives per mirror is 1/(n – 1). So, using the 8 drive systems shown in the diagrams, the chance that loosing a second drive would bring down the RAID...

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