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Linux crontab Command

Command Introduction (命令介绍)

crontab - maintains crontab files for individual users

Command Format and Options (命令格式和选项)

#crontab --help
crontab: invalid option -- '-'
crontab: usage error: unrecognized option
Usage:
 crontab [options] file
 crontab [options]
 crontab -n [hostname]

Options:
 -u <user>  define user
 -e         edit user's crontab
 -l         list user's crontab
 -r         delete user's crontab
 -i         prompt before deleting
 -n <host>  set host in cluster to run users' crontabs
 -c         get host in cluster to run users' crontabs
 -s         selinux context
 -x <mask>  enable debugging

Default operation is replace, per 1003.2

Command Example (命令范例)

Schedule cron jobs to run on a time interval for the current user. Job definition format: "(min) (hour) (day_of_month) (month) (day_of_week) command_to_execute".

  • Edit the crontab file for the current user:

    crontab -e

  • View a list of existing cron jobs for current user:

    crontab -l

  • Remove all cron jobs for the current user:

    crontab -r

  • Sample job which runs at 10:00 every day. * means any value:

    0 10 * * * path/to/script.sh

  • Sample job which runs every minute on the 3rd of April:

    * * 3 Apr * path/to/script.sh

  • Sample job which runs at 02:30 every Friday:

    30 2 * * Fri path/to/script.sh