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AsA

Member

From: Milan - Italy

Registered: 2008-10-05

Posts: 46

Start python applications in background

Hi everyone,
I was trying to launch sonata with autostart.sh in openbox, when I realized that every python application (and sonata among them) "dies" when the shell is closed (autostart.sh is a bash script), even if '&' is used to run the command in background.

So, is there a workaround to have python application backgrounded when launched from terminals or bash scripts?

Thanks!

ghostHack

Member

From: Bristol UK

Registered: 2008-02-29

Posts: 261

Re: Start python applications in background

try subshelling it, the entry for sonata in my autostart.sh is

( sleep 2 && sonata --hidden) &

AsA

Member

From: Milan - Italy

Registered: 2008-10-05

Posts: 46

Re: Start python applications in background

Ok, now it's solved, sonata could be run simply with "sonata &", the problem I had was caused by an error I had done previously.

But still remains a doubt. Why running in a terminal emulator "(sonata &)" makes sonata backgrounded (can close the terminal), while typing "sonata &" (without brackets) simply don't?.
I didn't know of any magical power of round brackets.

Last edited by AsA (2008-11-10 20:28:21)

ddaedalus

Member

Registered: 2008-01-14

Posts: 54

Re: Start python applications in background

Most X apps should fork off the shell, like gvim for firefox.
When the shell is closed it terminates all jobs by sending SIGHUP. You can use nohup <programname> to launch a program you want to live after closing the shell.

Zeist

Arch Linux f@h Team Member

Registered: 2008-07-04

Posts: 532

Re: Start python applications in background

Ok, now it's solved, sonata could be run simply with "sonata &", the problem I had was caused by an error I had done previously.

But still remains a doubt. Why running in a terminal emulator "(sonata &)" makes sonata backgrounded (can close the terminal), while typing "sonata &" (without brackets) simply don't?.
I didn't know of any magical power of round brackets.

hmm... does sonata& and sonata & react differently?

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Profjim

Member

From: NYC

Registered: 2008-03-24

Posts: 658

Re: Start python applications in background

man nohup

and (in bash)

help disown

The difference between these escapes me right now. Except it's clear they're called differently: you "nohup COMMAND &" to start the command as backgrounded and not-to-be-killed when the shell closes. You "disown -h %1" to say that (already backgrounded or interrupted) job %1 should not be killed when the shell closes. I'm not sure if there's any difference in functionality beyond these calling differences. Anyone able to clarify?