Can 'at' command keep on working after ssh connection broke?

Question

I'm using ssh to connect to a remote server. And I execute

at 03:13Jun12 -f t.sh

would the remote host run this 't.sh' at 03:13 Jun 12 even if I broke this ssh connection? ( Assume the remote host is keep on running.)

mtak · Accepted Answer · 2014-06-11 14:27:57Z

1

Yes it would. The at command places the script in a file in /var/spool/cron/atjobs, which regularly get checked by the atd daemon.

answered Jun 11, 2014 at 14:27

mtak

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If this command need superuser authority. Will it have effect if I add a sudo at the beginning of at command?
– Zen
Jun 11, 2014 at 14:33
The at command has a setuid bit set so when you run it as a normal user it runs as user daemon (on Debian): -rwsr-sr-x 1 daemon daemon 46556 jun 9 2012 /usr/bin/at . The /var/spool/cron/atjobs directory is also owned by user daemon.
– mtak
Jun 11, 2014 at 14:38
So this means whatever I use normal user or root user to run an 'at' command, the system will execute it at the specific time?
– Zen
Jun 11, 2014 at 14:48
Yes, but it will run it as the user who created the at job.
– mtak
Jun 11, 2014 at 14:50
I saw it. I run it as root. By the way, it will be execute at the exact file path where I run the 'at' command?
– Zen
Jun 11, 2014 at 15:34

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