I have successfully installed unison and incron. I get unison to run just fine. I'm doing this all logged in as root by the way, I figure that's how this will be executed when i'm not logged in. I'm using ssh, and have a passwordless key file. I can successfully call unison and have it sync just fine. I can call the shellscript and that works too. But Nothing happens when the incron is triggered and unison is called. I also modified my incrontab to run unison directly and that doesn't work. And I don't see any errors. any help would be greatly appreciated! I'm still getting use to linux.

Unison default.prf

# Unison preferences file
sshargs = -i uni
batch = true
silent = true
log = true
logfile = /var/log/unison.log

root = /var/www
root = ssh://ipaddress//var/www/

path = test

ignore =  Name test/sub2/suber
confirmbigdel = false

Incrontab -e

/var/www/test/ IN_ALL_EVENTS /root/au.sh



unison -batch

I can run my shellscript just fine. I'm adding the batch flag again just for kicks. I know that incrontab is working, I see output in the /var/log/sys.log

Oct 18 19:38:27 inctrg-dev-01 incrond[682]: (root) CMD (/root/au.sh)
  • I believe your problem is the same as the one addressed in this question here. If that solution works, be sure to upvote it and indicate that in this post. Oct 19, 2016 at 15:48
  • its similar, but the suggestion for using a passwordless key has already been tried. I ended up going back to rsync and that works just fine. I'll have to dig deeper with its options to make sure its doing what I have in mind. Good luck to anyone still trying to make this work. Unison hasn't been updated... in a decade?
    – aibarra
    Oct 19, 2016 at 20:25
  • 1
    Well, the issue in that question wasn't just about using a passwordless key, but about incron running in a different environment. Anyways, maybe change the line in incrontab to redirect stdout and stderr of that command to a log (catch the error there). And Unison has been updated recently. It's just that since all the versions of Unison have to be the same on each machine being synced, many old versions are used by default. But really I doubt this is an issue with Unison anyways since it works fine when you run it manually. Oct 20, 2016 at 0:43
  • Also looking at /var/log/unison.log would have been the first thing to do (yeah, I know, I always forgot to read the logs too!). As the script is run, then unison would be run and must output something useful.
    – Yvan
    Dec 1, 2018 at 19:14
  • Or change the incron command to: /root/au.sh 2>&1 >> /root/au.log so that all errors are logged before the unison is invoked.
    – Yvan
    Dec 1, 2018 at 19:17


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