Difference between revisions of "Cron Notes"
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# asterisk, so if you want to say ''every two hours'', just use ''*/2''. | # asterisk, so if you want to say ''every two hours'', just use ''*/2''. | ||
# | # | ||
− | # Example | + | # Example system /etc/crontab excerpt: |
# # run five minutes after midnight, every day | # # run five minutes after midnight, every day | ||
− | # 5 0 * * * $HOME/bin/daily.job >> $HOME/tmp/out 2>&1 | + | # 5 0 * * * root $HOME/bin/daily.job >> $HOME/tmp/out 2>&1 |
# # run at 2:15pm on the first of every month -- output mailed to paul | # # run at 2:15pm on the first of every month -- output mailed to paul | ||
− | # 15 14 1 * * $HOME/bin/monthly | + | # 15 14 1 * * root $HOME/bin/monthly |
# # run at 10 pm on weekdays, annoy Joe | # # run at 10 pm on weekdays, annoy Joe | ||
− | # 0 22 * * 1-5 mail -s "It's 10pm" joe%Joe,%%Where are your kids?% | + | # 0 22 * * 1-5 root mail -s "It's 10pm" joe%Joe,%%Where are your kids?% |
− | # 23 0-23/2 * * * echo "run 23 minutes after midn, 2am, 4am ..., everyday" | + | # 23 0-23/2 * * * root echo "run 23 minutes after midn, 2am, 4am ..., everyday" |
− | # 5 4 * * sun echo "run at 5 after 4 every sunday" | + | # 5 4 * * sun root echo "run at 5 after 4 every sunday" |
</pre> | </pre> |
Revision as of 19:08, 31 January 2007
I have huge, horrible, complex cron files. I stick this big comment at the top of the /etc/crontab file so I don't have to keep going back to the man page.
# The time and date fields are: # field allowed values # ----- -------------- # minute 0-59 # hour 0-23 # day of month 1-31 # month 1-12 (or names, see below) # day of week 0-7 (0 or 7 is Sun, or use names) # A field may be an asterisk (*), which always stands for ''first-last''. # # Ranges of numbers are allowed. Ranges are two numbers separated with a hyphen. # The specified range is inclusive. For example, 8-11 for an ''hours'' entry # specifies execution at hours 8, 9, 10 and 11. # # Lists are allowed. A list is a set of numbers (or ranges) separated by commas. # Examples: ''1,2,5,9'', ''0-4,8-12''. # # Step values can be used in conjunction with ranges. Following a range with # ''/<number>'' specifies skips of the number's value through the range. # For example, ''0-23/2'' can be used in the hours field to specify command # execution every other hour (the alternative in the V7 standard is # ''0,2,4,6,8,10,12,14,16,18,20,22''). Steps are also permitted after an # asterisk, so if you want to say ''every two hours'', just use ''*/2''. # # Example system /etc/crontab excerpt: # # run five minutes after midnight, every day # 5 0 * * * root $HOME/bin/daily.job >> $HOME/tmp/out 2>&1 # # run at 2:15pm on the first of every month -- output mailed to paul # 15 14 1 * * root $HOME/bin/monthly # # run at 10 pm on weekdays, annoy Joe # 0 22 * * 1-5 root mail -s "It's 10pm" joe%Joe,%%Where are your kids?% # 23 0-23/2 * * * root echo "run 23 minutes after midn, 2am, 4am ..., everyday" # 5 4 * * sun root echo "run at 5 after 4 every sunday"