hebcal(1) on Linux
The text d51d82aeb7f0, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
a Jewish calendar generator
Flags it lists
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-8 -
-D -
-H -
-I -
-L -
-S -
-T -
-Y -
-a -
-c -
-d -
-e -
-h -
-i -
-l -
-o -
-r -
-s -
-t -
-w -
-y