Jul 29

Disown and background a Unix process

Ever run a very large job and regretting not starting it in the excellent screen utility? If you don't have something like reptyr or retty, you can do the following.

Push the running job into the background using Control-Z and then background it. Then disown that job from the terminal. At least it will keep running. And if you want to kick off another job when the disowned process finish you can run a little script in a new terminal and checking for the disowned job to finish. Running the new script in screen first off course.

Background and disown process:

# rsync -av /zfsapp/u06/* /backup/u06/
sending incremental file list
temp01.dbf
^Z
[1]+  Stopped                 rsync -av /zfsapp/u06/* /backup/u06/

# bg
[1]+ rsync -av /zfsapp/u06/* /backup/u06/ &

# disown %1

# ps -ef | grep u06
    root 23903 23902   1 07:05:07 pts/5       0:01 rsync -av /zfsapp/u06/temp01.dbf
    root 23901  2656   1 07:05:07 pts/5       0:01 rsync -av /zfsapp/u06/temp01.dbf
    root 23902 23901   0 07:05:07 pts/5       0:00 rsync -av /zfsapp/u06/temp01.dbf

Check for a process id to finish before starting a new job:

# more cp_u06.sh
#!/bin/bash
while ps -p 23903 > /dev/null;
do
 printf "."
 sleep 60;
done
echo
echo "last rsync finished starting new"
rsync -av /zfsapp/u07/* /backup/u07/

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