This script checks if it's the last day of the month, or the 15th, and executes only under those circumstances. Then, I put it in the crontab to run every day.
#!/usr/bin/bash
TOMORROW=`/usr/bin/date -d tomorrow +%d`;
if [ ! ( "$TOMORROW" == "01" -o "$TOMORROW" == "16" ) ]; then
exit
fi
# Instructions to execute
-Attribution
And in Perl:
#!/usr/local/bin/perl
use strict;
my ($mday,$wday,$j);
($j,$j,$j,$mday,$j,$j,$wday,$j,$j) = localtime(time);
#Only run the first saturday of the month
exit unless($wday == 6 && $mday <= 7);
# Instructions to execute
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