idiff(1) on Linux
The text 7c15cd513b7f, as Debian 7 (Wheezy) shipped it.
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Flags it lists
-
--help -
-a -
-abs -
-fail -
-failpercent -
-hardfail -
-hardwarn -
-o -
-od -
-p -
-scale -
-v -
-warn -
-warnpercent