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 Forum index » Off-Topic Area » Programming
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simargl

Joined: 11 Feb 2013
Posts: 572
PostPosted: Wed 15 May 2013, 06:40    Post subject:  .  
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Last edited by simargl on Sun 01 Sep 2013, 12:04; edited 3 times in total
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Karl Godt


Joined: 20 Jun 2010
Posts: 4208
Location: Kiel,Germany
PostPosted: Wed 15 May 2013, 07:24    Post subject:  
probably try to use grep -m1 or grep | tail -n1 so if more than one line in /tmp/output it piks the first or the last , so if tail at the very end might be already get one single line after all the sed edits .

cat /tmp/output | grep is seen everywhere, but grep /tmp/output should do it also .
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simargl

Joined: 11 Feb 2013
Posts: 572
PostPosted: Wed 15 May 2013, 08:09    Post subject:  
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Last edited by simargl on Sun 01 Sep 2013, 11:09; edited 1 time in total
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Karl Godt


Joined: 20 Jun 2010
Posts: 4208
Location: Kiel,Germany
PostPosted: Wed 15 May 2013, 08:15    Post subject:  
Quote:
while [ "$(pidof yad)" ]; do

Sometimes seems not to work as it could.
Probably missing a break, since the test for "$(pidof yad)" might only run once at while begin.
Probably needs additionally a
[ "$(pidof yad)" ] || break
inside it to stop the current loop. Otherwise you'll probably have multiple instances of the while loop running .
like
Code:
while [ "$(pidof yad)" ]; do
  sleep 5s
  [ -f /tmp/output ] || break
  [ "$(pidof yad)" ] || break
  NEW_TITLE=$(grep 'StreamTitle' /tmp/output | tail -n1 | sed 's|ICY Info: StreamTitle=||g' | sed 's/;[^-]*$//' | sed s/"'"/" "/g)
  if [[ "$NEW_TITLE" != "$TITLE" ]]; then
    notify-send -i simple-radio "$action" "$NEW_TITLE"
    TITLE="$NEW_TITLE"
  fi
done
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simargl

Joined: 11 Feb 2013
Posts: 572
PostPosted: Wed 15 May 2013, 08:32    Post subject:  
.
Last edited by simargl on Sun 01 Sep 2013, 11:09; edited 1 time in total
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Karl Godt


Joined: 20 Jun 2010
Posts: 4208
Location: Kiel,Germany
PostPosted: Wed 15 May 2013, 10:48    Post subject:  
No GUI freak here, and know nothing about yad.

You have yad GUI and yad --notification .

Probably this is confusing things , so running a new instance of the yad gui would prevent the loop from exiting/breaking.

Otherwise yad --notification might need killall -9 which almost every time succeeds .

You should remove the >/dev/null s to have a better view on things .
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PANZERKOPF

Joined: 16 Dec 2009
Posts: 282
Location: Earth
PostPosted: Wed 15 May 2013, 11:47    Post subject: Re: lost inside while loop  
simargl wrote:
like variable $action

IIRC:
Loop runs as a separate process so all variables inside it are not visible by parent process.
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technosaurus


Joined: 18 May 2008
Posts: 4819
Location: Kingwood, TX
PostPosted: Thu 16 May 2013, 01:30    Post subject:  
Please don't poll for file changes.
Code:
touch /tmp/file #make sure it exists
inotifyd - /tmp/file:c |while read DUMMY; do
    echo actions to do when file is changed
done &

inotifyd will be dormant (using almost no resources) until awakened by an inotify event from the kernel (no polling) - you can get 500 events in 1 second or have the process running dormant for days and it would pop right up as soon as the file changes
Note: inotifyd can monitor stuff other than just changes (:c) including entire directories
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simargl

Joined: 11 Feb 2013
Posts: 572
PostPosted: Thu 16 May 2013, 03:45    Post subject:  
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