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Select or download this

#!/usr/bin/perl -s
if ($a) { print "user selected a\n"; }
elsif ($b) { print "user selected b\n"; }
elsif ($c) { print "user selected c\n"; }
else { print "no args!\n"; }

Select or download this

[larryk@home] /home/larryk > somescript -a
user selected a
...
user selected c
[larryk@home] /home/larryk > somescript
no args!