bash problem

stripe · 06-09-2013, 04:52 PM

hi all
anyone know the best place to post a bash scripting question on this forum?

cheers

stripe

John VV · 06-09-2013, 04:59 PM

Programming ? maybe

But what is this question ?

stripe · 06-09-2013, 05:07 PM

I am trying to use an error statement from the output of a terminal generated by a program (vlc) in an if statement to trigger an exit trap to cleanly exit the bash script.

the error message i want to use is added below the script.
cheers

http://pastebin.com/zpdw7Ycz

Firerat · 06-09-2013, 06:28 PM

you could test the exit code of cvlc like this

Code:

cvlc "$@"
if [ "$?" != "0" ];
then
    exit
fi

The above if is not very smart

Code:

cvlc "$@";cvlc_exit=$?
if [ "$cvlc_exit" != "0" ];
then
    echo "cvlc \"$@\" failed with exitcode $cvlc_exit"
    exit
fi

Better, but a case statement would give you more control ( assuming you have a list of exit codes from the source/docs )

stripe · 06-09-2013, 06:41 PM

thanks for good the answers but the problem is cvlc/vlc is not exiting if the player window is closed manualy before it is finiheg it still runs in the background and the only output from the terminal when the window is closedare tgeese two lines:

***[0xad4046f0] xcb_window window error: X server failure
xdg-screensaver: Window 0x03400000 does not exist***

and i cant find a way to use that code to trigger an exit trap

hope this makes sense as ist only my second script

thanks again

Firerat · 06-09-2013, 08:28 PM

Ahh, yes I miss-understood

OK , I really don't like this .. but one way to do it

Code:

coproc cvlc "$@" 2> cvlc.log
while [ $COPROC_PID ];do
    grep -q "xcb_window window error" cvlc.log && kill $COPROC_PID ; sleep 10 || sleep 10
done

you will want to put the log somewhere 'clean' instead of the working dir as above put you get the idea

I never liked vlc so I never use it
Any reason you can't use mplayer?