slogin(1) on Linux
The text ced5cdb230b0, as Debian 8 (Jessie) shipped it.
OpenSSH SSH client (remote login program)
Flags it lists
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-1 -
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-6 -
-A -
-C -
-D -
-E -
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-I -
-K -
-L -
-M -
-N -
-O -
-R -
-S -
-T -
-V -
-W -
-X -
-Y -
-a -
-b -
-c -
-e -
-f -
-g -
-i -
-k -
-l -
-m -
-n -
-o -
-p -
-q -
-s -
-t -
-v -
-w -
-x -
-y