here's how to determine all the other months with five fridays for the next 20years, (ba)shilifically:
#!/bin/sh year=2010 month=1 x=1 while [ $x -le 20 ] do until [ $month -gt 12 ] do cal=`cal $month $year | grep ^31` if [ -z "$cal" ] then echo -n "" else echo cal $month $year fi month=`expr $month + 1` done month=1 year=`expr $year + 1` x=$(( $x + 1 )) done
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