topic Re: background process in Operating System - HP-UX

background process

Shivkumar — Tue, 14 Feb 2006 21:18:10 GMT

Is there a command to check background running processes ? if yes then how to move them between foreground and background ?

thanks,
shiv

Re: background process

Rajeev Shukla — Tue, 14 Feb 2006 21:28:12 GMT

jobs is the command to see how many jobs are in stoped state (means not running)

to move the job to background do
bg
to move the job to foreground run
fg

Re: background process

Arunvijai_4 — Tue, 14 Feb 2006 22:32:01 GMT

Hi Shiv,

You can use "bg" and "fg". You can take a look at the man pages for more information.

-Arun

Re: background process

Arunvijai_4 — Tue, 14 Feb 2006 22:39:06 GMT

Hi Shiv,

This link provides with Monitoring and Tracing Unix Processes on various Unix OS.

http://www.idevelopment.info/data/Unix/General_UNIX/GENERAL_MonitoringandtracingUnixprocesses.shtml

-Arun

Re: background process

Senthil Prabu.S_1 — Tue, 14 Feb 2006 23:13:21 GMT

Hi shiva,
to know the process running in background on unix machines, refer this link;
http://www.unixguide.net/unix/faq/3.7.shtml

And fg and bg are the commands to shift process between background and foreground.

Re: background process

Arunvijai_4 — Tue, 14 Feb 2006 23:22:00 GMT

Hi Shiv,

You have to find the job number using job command. Then, You can do the following

To put the #999 job in the background
# bg %999

To would bring it back in the foreground.

# fg %999

-Arun

Re: background process

Yogeeraj_1 — Tue, 14 Feb 2006 23:52:38 GMT

hi shiv,

below more information on fg and bg:

fg [%]

and

bg [%]

The fg command can be used to restart the execution of a suspended or backgrounded command or program in foreground mode. With no arguments, the fg command causes the current job (the one shown in the output of the jobs command with a + sign next to it) to be resumed in foreground mode. The program will take control of your terminal, just as though you'd originally run it in the foreground. As always, you can resuspend the process by pressing CTRL-Z.

With a single argument consisting of a percent sign (%) and the job index of a backgrounded or suspended job (as listed by the jobs command), the fg command brings the specified process to the foreground, resuming it if it was previously suspended.

The bg command is analogous to the fg command, but allows you to resume a suspended process in background mode, rather than foreground mode. Like the fg command, the bg command will accept a single argument consisting of a percent sign and a job index, or, with no arguments, will operate on the current job.

In the example below, our YD resumes running his second terminal emulator window in the background, and resumes reading the manual page for the C shell in the foreground:

[18] YD@MYSERVER# jobs
[1] + Stopped man csh
[2] - Stopped /usr/bin/X11/xterm
[3] - Running /usr/bin/X11/xterm
[19] YD@MYSERVER# bg %2
[1] + Running /usr/bin/X11/xterm
[20] YD@MYSERVER# jobs
[1] - Stopped man csh
[2] + Running /usr/bin/X11/xterm
[3] - Running /usr/bin/X11/xterm
[21] YD@MYSERVER# fg %1
man csh
.
.
.

Note that the shell automatically prints a reminder message after each bg or fg command, to let you know what process has been resumed.

hope this helps too!

kind regards
yogeeraj

Re: background process

Muthukumar_5 — Wed, 15 Feb 2006 00:54:11 GMT

Use bg to check the background process informations. To make them from background to foreground use fg.

# sleep 100&
# bg
# fg

it will give you the details.

--
Muthu

Re: background process

Muthukumar_5 — Wed, 15 Feb 2006 01:15:29 GMT

Read ksh man page for Jobs part. It is all related to this question.

--
Muthu

Re: background process

Arunvijai_4 — Wed, 15 Feb 2006 01:21:32 GMT

Hi Shiv,

# man sh-posix

will give you all the details.

-Arun

Re: background process

Shivkumar — Wed, 15 Feb 2006 13:33:59 GMT

Are "job id" and "process id" two different things ?

Regards,
Shiv

Re: background process

James R. Ferguson — Wed, 15 Feb 2006 13:38:58 GMT

Hi Shiv:

Do this:

# sleep 120 &
[1] 21132
# jobs
[1] + Running sleep 120 &

The job number is in brackets; The pid (process ID) is next.

Regards!

...JRF...

Re: background process

James R. Ferguson — Wed, 15 Feb 2006 13:56:11 GMT

Hi (again) Shiv:

I guess I should add that the job number is a shorthand way of referring to the background process. Every process has a process ID or 'pid'. This is the kernel's way of tracking the process.

The section titled JOBS in the 'sh_posix' manpages offers more information.

Regards!

...JRF...