crontab
crontab
定时任务
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