68 lines
1.9 KiB
Text
68 lines
1.9 KiB
Text
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#! /usr/bin/ksh
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alias datecalc=/usr/local/bin/datecalc
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# weekselector --- script to assist in scheduling cron jobs
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# Perderabo Oct 11, 2003
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#
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# example:
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# You want to run command1 on the first monday of each month and
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# you want to run command2 on the last monday of each month.
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# Just use this syntax:
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#
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# 0 0 * * 1 /usr/local/bin/weekselector 1st && command1
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# 0 0 * * 1 /usr/local/bin/weekselector last && command2
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#
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# Version 2.0 March 23, 2005
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#
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# You can now use "even" or "odd" to run commands every other week.
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# Whether or not a week is "even" or "odd" is arbitrary, but if one week
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# is "odd", the next will be "even". An "even" Monday will be in the same
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# week as an "even" Tuesday.
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integer month day year first last leap
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set -A mdy $(date "+%m %d %Y")
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month=${mdy[0]}
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day=${mdy[1]}
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year=${mdy[2]}
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#date "+%M %d %Y" | read month day year
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case $1 in
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even|Even|EVEN|odd|Odd|ODD)
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integer dow mjd fmjd wk
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dow=$(datecalc -d $year $month $day)
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mjd=$(datecalc -j $year $month $day)
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((fmjd=mjd-dow))
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((wk=fmjd/7))
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((wk=wk+${#1}))
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((wk/2*2 == wk))
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exit $?
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;;
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1|1st|1ST|first|First|FIRST) last=7 ;;
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2|2nd|2ND|second|Second|SECOND) last=14 ;;
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3|3rd|3RD|third|Third|THIRD) last=21 ;;
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4|4th|4TH|fourth|Fourth|FOURTH) last=28 ;;
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last|Last|LAST)
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# ja fe ma ap ma jn jl ag se oc no de
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set -A mlength xx 31 28 31 30 31 30 31 31 30 31 30 31
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if ((month != 2)) ; then
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last=${mlength[month]}
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else
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leap=0
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if ((!(year%100))); then
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((!(year%400))) && leap=1
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else
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((!(year%4))) && leap=1
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fi
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last=28
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((leap)) && last=29
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fi;;
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*) exit 1;;
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esac
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((first=last-6))
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((first<=day && day<=last))
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exit $?
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