squidclient(1) on Linux
The text ce4c94db49e1, as Debian 7 (Wheezy) shipped it.
Flags it lists
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-A -
-H -
-I -
-P -
-T -
-U -
-V -
-W -
-a -
-g -
-h -
-i -
-j -
-l -
-m -
-p -
-r -
-s -
-t -
-u -
-v -
-w