Running command simultaneously

tuesday · 04-17-2008, 01:34 AM

Hi guys!

Anyone got any idea regarding this topic? I'm trying to build a script that will run two application but the problem is I failed to make it run simultaneously. Thanks in advance

Micro420 · 04-17-2008, 01:42 AM

Does it have to run EXACTLY simultaneously?

tuesday · 04-17-2008, 02:25 AM

Yes, both of them need to be run for 72 hours, so it will take too much time if I want to run them consecutively.

colucix · 04-17-2008, 02:34 AM

You can run them in background and wait for completion before proceeding. For example, if you have two processes, process_1 and process_2 you can do something like this

Code:

#!/bin/bash
#
#  launch first process in background
#
/path/to/process_1 &
#
#  retrieve the pid of the last job
#
pid_1=$!
#
#  launch second process in background (optional)
#
/path/to/process_2 &
#
#  retrieve the pid of the last job (optional)
#
pid_2=$!
#
#  wait for the first process to complete
#
wait $pid_1
#
#  wait for the second process to complete (optional), then go on
#
wait $pid_2

You can launch only the first process in background, then let the second one to complete and finally check if the first process has done.

tuesday · 04-17-2008, 04:18 AM

Hey thanks. I'll give it a try after this

billymayday · 04-17-2008, 04:28 AM

If they don't need to be at exactly the same time, try using "at" - two entries both set to start at the same time (or "at now")