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# Memory Aid
# environment HOME=$HOME SHELL=$SHELL LOGNAME=$LOGNAME PATH=$PATH
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#
# string meaning
# ------ -------
# @reboot Run once, at startup.
# @yearly Run once a year, "0 0 1 1 *".
# @annually (same as @yearly)
# @monthly Run once a month, "0 0 1 * *".
# @weekly Run once a week, "0 0 * * 0".
# @daily Run once a day, "0 0 * * *".
# @midnight (same as @daily)
# @hourly Run once an hour, "0 * * * *".
#mm hh Mday Mon Dow CMD # minute, hour, month-day month DayofW CMD
#........................................Minute of the hour
#| .................................Hour in the day (0..23)
#| | .........................Day of month, 1..31 (mon,tue,wed)
#| | | .................Month (1.12) Jan, Feb.. Dec
#| | | | ........day of the week 0-6 7==0
#| | | | | |command to be executed
#V V V V V V
* * 28-31 * * [ `date -d +'1 day' +\%d` -eq 1 ] && echo "Tomorrow is the first today now is `date`" >> ~/message
1 0 1 * * rm -f ~/message
* * 28-31 * * [ `date -d +'1 day' +\%d` -eq 1 ] && echo "HOME=$HOME LOGNAME=$LOGNAME SHELL = $SHELL PATH=$PATH"
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Answer by Leslie Satenstein for Cron job to run on the last day of the month
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