signalgen(1) on Linux
The text c4797c66be16, as Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it.
a simple signal generator program
Flags it lists
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-1 -
-2 -
-2a -
-A -
-C -
-a -
-f -
-h -
-o -
-s -
-t -
-v -
-w -
-x10 -
-x100