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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.)

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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.

  • If this command need superuser authority. Will it have effect if I add a sudo at the beginning of at command? – Zen Jun 11 '14 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 '14 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 '14 at 14:48
  • Yes, but it will run it as the user who created the at job. – mtak Jun 11 '14 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 '14 at 15:34

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