Linux 101 Hacks

UNIX / Linux pmap Command Examples

SathiyaMoorthy — Thu, 03 Jun 2010 07:04:00 +0000

What is pmap ? 3 pmap examples Syntax and Options Related Commands What is pmap ? pmap displays the memory map of a process for the specified pid(s). 3 pmap Examples View the memory map of a process To view the memory map of a process, specify the PID of it. It displays the process [...]

UNIX / Linux eject Command Examples

SathiyaMoorthy — Thu, 03 Jun 2010 07:02:12 +0000

What is eject ? 4 eject examples Syntax and Options Related Commands What is eject ? eject command is mainly used to eject the CD / DVD tray. You can also close the tray using certain options. eject command can be used to eject floppy disk, tape, or JAZ or ZIP disk. eject command can [...]

UNIX / Linux iostat Command Examples

SathiyaMoorthy — Wed, 02 Jun 2010 07:04:45 +0000

What is iostat? 4 iostat examples Syntax and Options Related Commands What is iostat? Iostat command reports CPU and I/O statistics. iostat command is used during performance analysis to narrow down the problematic areas in the system. Sample output of iostat command and its explanation: $ iostat Linux 2.6.31-17-generic (sathiya-laptop) 05/25/10 _i686_ (1 CPU) avg-cpu: [...]

UNIX / Linux shutdown Command Examples

SathiyaMoorthy — Wed, 02 Jun 2010 07:02:07 +0000

What is shutdown? 5 shutdown examples Syntax and Options Related Commands What is shutdown? Shutdown the system in a safe way. You can shutdown the machine immediately, or schedule a shutdown using 24 hour format. After bringing down the system, shutdown command halts or reboots the system according to the option that is specified. Only [...]

UNIX / Linux md5sum Command Examples

SathiyaMoorthy — Tue, 01 Jun 2010 07:04:24 +0000

What is md5sum? 5 md5sum examples Syntax and Options Related Commands What is md5sum? md5sum is a 128 bit checksum which will be unique for the same data provided. Use md5sum command to calculate and cross check the md5sum. Two non identical files will never have the same md5sum. Typically, md5sum is used to cross [...]

UNIX / Linux chmod Command Examples

SathiyaMoorthy — Tue, 01 Jun 2010 07:02:20 +0000

What is chmod? 3 chmod examples Syntax and Options Related Commands What is chmod? chmod stands for change mode, which changes the file or directory mode bits. To put it simply, use chmod command to change the file or directory permissions. Following is a sample of ls -l command output. In this, the 9 characters [...]

UNIX / Linux umount Command Examples

SathiyaMoorthy — Mon, 31 May 2010 07:04:00 +0000

What is umount? 3 umount examples Syntax and Options Related Commands What is umount? umount stands for unmount, which unmounts the file system. Use umount to unmount a device / partition by specifying the directory where it has been mounted. Following is the partial output of the mount command. # mount /dev/sdb1 on /mnt type [...]

UNIX / Linux exportfs Command Examples

SathiyaMoorthy — Mon, 31 May 2010 07:02:12 +0000

What is exportfs? 3 exportfs examples Syntax and Options Related Commands What is exportfs? exportfs stands for export file system, which exports file system to a remote server which can mount, and access it like a local file system. You can also unexport the directories using exportfs command. 3 exportfs Examples Export a directory to [...]

How to View Windows CHM Files on Linux

SathiyaMoorthy — Tue, 11 May 2010 07:02:45 +0000

Question: Someone sent me a *.chm file. I don’t have windows machine. Is it possible to view a *.chm file on a Linux system.? Answer: Use kchmviewer to view chm files as explained below. First, verify whether you already have the kchmviewer command on your system. # whereis kchmviewer kchmviewer: /usr/bin/kchmviewer Install kchmviewer to view [...]

Unix Nohup: Run a Command or Shell-Script Even after You Logout

SathiyaMoorthy — Tue, 04 May 2010 07:02:53 +0000

When you execute a Unix job in the background ( using &, bg command), and logout from the session, your process will get killed. You can avoid this using several methods — executing the job with nohup, or making it as batch job using at, batch or cron command. This quick tip is for beginners. [...]