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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