Useful UNIX Commands

Command: grep
Description: finds text within file
Options:
-n - prepend line number into the output file
Example:
grep searches for the into the file
Variation: all

Command: ifconfig
Description: to set network connection
Options:
a - to show all options
Example:
Variation: all

Command: stty
Description: To set the terminal setting.
Options:
a - to show all options
Example: stty erase to set the backspace key to erase command line text.
Variation: all

command: uname
Description: To show the system information
Options: -snrvmapiX
-a - to show system detail
-X - to show detail
Example:
Variation: all

command: Get release version
Description: cat /var/sadm/softinfo/INST_RELEASE OR cat /etc/release

Command: sar
Description: Memory usage
Variation: Solaris

Command: psrinfo -v
Description: CPU specification
Variation: Solaris

Command: mpstat
Description: Process Usage
Variation: Solaris


Command: prstat
Description: process detail
Options: -s size
Variations: Solaris

Command: /usr/sbin/prtconf | grep size
Description: Memory available
Variation: Solaris

Command: swap
Description: Swap space
Options: ls
Variations: Solaris


Command: find /usr/local/web -size +20000 -print
Description: Find the files with minimum given size: it prints file names more than 10MB of sizes
Options: find
-size
-print
Example: find /usr/local/web -size +20000 -print


Command: > find . -name file-name
Description: Find a file
Options:
-name
Variation: Solaris
Example: find . -name file-name

Command: du
Description: Disk usage
Options:
. : current directory
-s: sum of disk usage
-k: in Kilobytes
-h: human readable format
Example: du -sh *
Variation: All

Command: df
Description: Disc space occupied by the filesystem directory/files
Options:
-k: in Kilobytes
Example: du -k | grep /usr/local would show you the size and percentage of usage

Setting environment variable
C Shell:
Setting environment: setenv PATH "${PATH}:/usr/local:/usr/local/bin"
Unsetting environment: unsetenv PATH


Re-executing the changed shell file
C-Shell: source .cshrc
Korn Shell: . .profile
Bash-Shell: . .bashrc

Check if a process is running:
ps -ef | grep
e.g. to check if apache webserver is running
ps -ef | grep httpd

Change permission and ownership of file
chmod 777 file_name/dir_name
chmod o+rwx file_name/dir_name

chown user_name file_name

Command: checkuser -n netgroup
checkuser -u username
get the detail of the user id

Resourceful Unix command site:

http://www.computerhope.com/unix.htm
http://sysunconfig.net/unixtips/solaris.html
http://www.panix.com/~elflord/unix/grep.html - Grep tutorial