[Smaug] A quick scripting puzzle

[Peter Belew]

For amusement, create a 1-line sh or bash command which will set
a shell variable $LASTSUNDAY to the date (2-digit day) of the last
Sunday in the current month.

Like

   LASTSUNDAY=`some_shell_stuff`

Use only standard Unix utilities such as 'cat' or 'head' or 'date'.

The command shouldn't take longer than an 80-character line.

(I did this myself for creating a cron job which sends out email
announcing a meeting on the last sunday of a month).

:)

 Peter

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