> perl -le 'print "I am $$. I sleep now."; kill STOP => $$; print "I am awake again!"'
I am 22667. I sleep now.
Stopped (signal)

> perl -e 'kill CONT => 22667'
I am awake again!
[1] 22667 Exit 0 perl -le print "I am $$. I sleep now."; kill STOP => $$; print "I am alive again!"