List crontab
# crontab -l [username]
Edit(Create) crontab
$ crontab -e [username]
Remove crontab
$ crontab -r [username]
Listup crontab files
$ ls -l /var/spool/cron/crontabs
Initialize crontab editor
# rm -f ~/.selected_editor (Ubuntu)
Check cronbab is running
# ps -ef | grep crond
root 53477 53445 0 06:35 pts/2 00:00:00 grep --color=auto crond
# grep CRON /var/log/syslog
# vi /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/
# For details see man 4 crontabs
# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * user-name command to be executed
45,5 10 * * 1-5 root /usr/bin/rdate -s time.bora.net && clock -w
Sources
http://webdir.tistory.com/174
http://ezsimple.inmu.net/zb/view.php?id=free&no=215&page=10&headnum=
http://zeronica.tistory.com/105
https://www.linux.co.kr/