I'd like to start a long running script via SSH and immediately return. Afterwards, I want to check the remote host every 5 minutes to see if the job is done.
In order to accomplish the first part, I used this trick:
ssh root@remoteserver 'TMP_FILE=$(mktemp --tmpdir backup.XXXXXXXXXX.log) && (/root/backup.sh </dev/null > $TMP_FILE 2>&1 &) && echo $TMP_FILE'
Now, for the second part, since backup.sh can be any script, I'd like to append something like
DONE_$TMP_FILE to the file pointed to by
$TMP_FILE when backup.sh terminates and, every 5 minutes, run this command:
ssh root@remoteserver 'tail -1 $TMP_FILE'
to see if the last line is equal to
The problem is that I can't manage to detach from a composite command:
ssh root@remoteserver 'TMP_FILE=$(mktemp --tmpdir backup.XXXXXXXXXX.log) && (/root/backup.sh </dev/null > $TMP_FILE 2>&1 && echo DONE_$TMP_FILE >> $TMP_FILE &) && echo $TMP_FILE'
The above command will simply block until
backup.sh finishes running.
Is there any way to detach from a sequence of commands without placing them in a wrapper shell script?
If there is any better way of doing this, I'd love to hear it. Ideally, I shouldn't need to create any auxiliary shell scripts.