Difference between revisions of "secureplatform cron"

Latest revision as of 00:45, 18 July 2013

root crons configured by running crontab -e at expert prompt

cron file will be save to...

/var/spool/cron/root

Each line in the /etc/crontab file represents a job and has the following format:

minute   hour   day   month   dayofweek   command

minute — any integer from 0 to 59

hour — any integer from 0 to 23

day — any integer from 1 to 31 (must be a valid day if a month is specified)

month — any integer from 1 to 12 (or the short name of the month such as jan or feb)

dayofweek — any integer from 0 to 7, where 0 or 7 represents Sunday (or the short name of the week such as sun or mon)

command — the command to execute (the command can either be a command such as ls /proc >> /tmp/proc or the command to execute a custom script)

01 * * * * /usr/local/bin/cron.hourly.sh

02 4 * * * /usr/local/bin/cron.daily.sh

22 4 * * 0 /usr/local/bin/cron.weekly.sh

42 4 1 * * /usr/local/bin/cron.monthly.sh

@@ Line 4: / Line 4: @@
   /var/spool/cron/root
+== cron file format ==
+Each line in the /etc/crontab file represents a job and has the following format:
+ minute   hour   day   month   dayofweek   command
+minute — any integer from 0 to 59
+hour — any integer from 0 to 23
+day — any integer from 1 to 31 (must be a valid day if a month is specified)
+month — any integer from 1 to 12 (or the short name of the month such as jan or feb)
+dayofweek — any integer from 0 to 7, where 0 or 7 represents Sunday (or the short name of the week such as sun or mon)
+command — the command to execute (the command can either be a command such as ls /proc >> /tmp/proc or the command to execute a custom script)
+== crontab file examples ==
+* * * * /usr/local/bin/cron.hourly.sh
+4 * * * /usr/local/bin/cron.daily.sh
+4 * * 0  /usr/local/bin/cron.weekly.sh
+4 1 * * /usr/local/bin/cron.monthly.sh
 [[category:sysadmin]]