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# 1  
Old 03-10-2016
Send sleep to background

Hello all,

I've a small script where it checks for the existence of a particular file and sleeps for 5 seconds if it doesn't exist. I would like to send the sleep output to background so that I don't see so many sleep messages in the build output.

#!/bin/sh -x
until [ -f /tmp/examplefile.txt ]
sleep 3
echo "File found"

Adding & to the end of the sleep command doesnt work. Any help is much appreciated.


Last edited by jim mcnamara; 03-10-2016 at 10:16 PM..
# 2  
Old 03-10-2016
Linux has the inotify command to do exactly this. What OS do you have?
# 3  
Old 03-10-2016
RedHat 5 and Redhat 6
# 4  
Old 03-11-2016
Any reason you are using the sh -x option? Try leaving that out.

Last edited by Scrutinizer; 03-12-2016 at 02:40 AM..
# 5  
Old 03-11-2016
Originally Posted by builderj
I would like to send the sleep output to background
/usr/bin/sleep does not produce any output.....
# 6  
Old 03-11-2016
@rovf : /usr/bin/sleep did not work. Even tried /bin/sleep.

whereis sleep
sleep: /bin/sleep /usr/share/man/man1p/sleep.1p.gz /usr/share/man/man3p/sleep.3p.gz /usr/share/man/man1/sleep.1.gz /usr/share/man/man3/sleep.3.gz

@Scrutinizer : even after leaving our sh -x, it didn't work.
# 7  
Old 03-11-2016
WHAT "did not work"?

sleep itself does NOT produce any output, as rovf correctly stated. And, as Scrutinizer said, leaving out the -x option will stop xtrace output (which, btw, would go to stderr anyway).
If you are talking of the loop just keeps looping frantically, that's because you put sleep into background, peacefully sleeping there, side by side, while the main loop continues and continues and ...

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