Every
one knows that Process means program in execution and in Linux
everything is works by processes. So it's important to have good
knowledge of Process Management/Process Handling. Here Process
Management doesn't means that we learned during our academic years in subject called Operating System or Advance Operating System, it means,
simply working on process or handling it on Terminal/GNOME-Terminal.
I
am writing this blog for those Mind-Hunter's who are crazy to work on
Linux Terminal. See, it's simply impossible to know everything in
Linux, because Linux has 1000's of Distro for different purpose but
still we are crazy to learn new things and that is good.
Now
back to main topic, we know that if any one wants to know about
process details during execution of
Process or
simply when Process
is running,
we always suggest or use top
command in terminal. Thats shows following output on terminal.
 |
| Fig:- Output of top |
In
above fig, we can see all processes are running but you can also
check a particular
process information by using top
with
it's option -p
.
But
again we have to use top command and have to check for the process
ID, instead of doing this you can use pgrep
command to know the process ID. Normaly pgrep
is
use to find the process ID of any process, for this you just have to
follow following command.
pgrep
'process name'
 |
| Fig:- Output of pgrep |
Now
to check information of single process using top command follow this
command,
top
-p 'process_id'
 |
| Fig:- Output of top for single process |
There
are many other options are also available you can try them also. To
check documentation of top
command typr man
top
on Gnome-terminal.
Top
is a great command to work with runtime processes but I
will suggest to use htop
command.
htop is almost same as top
command but htop have some advance facilities for us. htop
show cpu,
memory
and swap
usage in better way.
 |
| Fig:-Output of htop |
You
can also modify the look of htop
by using it's setup option. To do so type shift+c
and you will move to setup , as per your need you can make changes in
htop and to exit setup press Esc button. htop
have more powerful option you can also try them. To see documentation
of htop
type man
htop.
It also have some short cut options that shown below when you use
htop(i.e.
Function keys).
 |
| Fig:- Setup of htop |
Ok nice explanation regarding how to use top command and see its options.
ReplyDeleteCan you please explain me that is there any option or command through which we can set priority to these processes?
We can set the priority of processes using 'nice' and 'renice' commands. You can refer to : http://www.nixtutor.com/linux/changing-priority-on-linux-processes/
DeleteThank you for your question Wasif. Okay answer of question is again in htop command, try to install htop and execute it on your terminal and then you find some option at the bottom of htop i.e. function keys for different purpose, okay now use F7 & F8 keys to change the nice value of runtime process, to select process use up & down arrow keys. When you change the nice value of any process, the priority of process automatically get change. You can change nice value of all process only if you are a root user, otherwise you can change nice values of processes of your current account only.
Delete"htop" is not available by default in Ubuntu.
ReplyDeleteWe have to use "sudo apt-get install htop"
Thank you so much sir, I forgot to mention it in my blog. :-)
Delete