atd 命令

常用示例

说明

atd is the daemon that executes jobs scheduled with the at command. It runs in the background, periodically checking /var/spool/at/ for pending jobs and executing them at their scheduled times. Jobs are submitted using at for time-specific scheduling or batch for load-based execution. The daemon runs jobs on behalf of the user who scheduled them, inheriting their environment and permissions. Access control is managed through /etc/at.allow and /etc/at.deny. If at.allow exists, only listed users can schedule jobs. If only at.deny exists, all users except those listed can schedule jobs. If neither exists, only root can use at. Related commands: - at - schedule a job for a specific time - atq - list pending jobs - atrm - remove a pending job - batch - schedule a job for when system load permits

参数

-d

Debug mode; print errors to stderr instead of syslog (implies -f)

-f

Run in foreground instead of daemonizing

-s

Process the at/batch queue once and exit

-l _load_avg_

Limit batch job execution to when system load is below this value (default: 1.5)

-b _interval_

Minimum seconds between starting batch jobs (default: 60)