To see currently running
process
|
ps
|
$ps
|
List the process using most CPU
|
Top , htop
|
$top
|
To stop any process by PID i.e. to
kill process
|
kill {PID}
|
$kill 1012
|
To stop processes by name i.e. to
kill process
|
killall {Process-name}
pkill
xkill
|
$killall httpd
|
To get information about all
running process
|
ps -ag
|
$ps -ag
|
To stop all process except your
shell
|
kill 0
|
$kill 0
|
For background processing (With
&, use to put particular command and program in background)
|
linux-command &
|
$ls / -R | wc -l &
|
To display the owner of the
processes along with the processes
|
ps aux
|
$ps aux
|
To see if a particular process is
running or not. For this purpose you have to use ps command in combination
with the grep command
|
ps ax |
grep process-U-want-to see
|
For e.g. you want to see whether
Apache web server process is running or not then give command
$ ps ax
| grep httpd
|
To see currently running processes
and other information like memory and CPU usage with real time updates.
|
top
|
$top
Note that to exit from top command press q. |
To display a tree of processes
|
pstree
|
$pstree
|
Search Process id of a process
|
pgrep
|
$pgrep firefox
|
Changing Priority of a process
|
nice , renice
|
$renice 19 PID
|
What Are Shell Scripts? In the simplest terms, a shell script is a file containing a series of commands. The shell reads this file and carries out the commands as though they have been entered directly on the command line. The shell is somewhat unique, in that it is both a powerful command line interface to the system and a scripting language interpreter. As we will see, most of the things that can be done on the command line can be done in scripts, and most of the things that can be done in scripts can be done on the command line. Writing Your First Script And Getting It To Work To successfully write a shell script, you have to do three things: Write a script Give the shell permission to execute it Put it somewhere the shell can find it Writing A Script A shell script is a file that contains ASCII text. To create a shell script, you use a text editor . A text editor is a program, like a word processor, that reads and writes ASCII text files. There are...
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