I parsed the output of the cal command for my solution:
cal 3 2009 | perl -anle '$.==1&&do{print};@F=unpack"A3"x7,$_;$.>2&&$F[
+2]=~m/^\s*\d+$/&&++$a==2&&print$F[2];'
If you want to specify the day's shortname (like 'Tu' for Tuesday) I had the slightly longer version:
cal 4 2009 | perl -anle '$.==1&&do{print};@F=unpack"A3"x7,$_;$.==2&&do
+{@i{@F}=0..$#F};$.>2&&$F[$i{"Tu"}]=~m/^\s*\d+$/&&++$a==2&&print$F[$i{
+"Tu"}];'
First one counts 82 and the second 121 characters (not counted cal [arguments] | perl -anle and the surrounding single quotes.
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