perform one or more flip operations on a portable anymap
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portable anymap as input. Performs one or more flip
operations, in the order specified, and writes out a
operations available are: left for right (-leftright
or -lr); top for bottom (-topbottom or
-tb); and transposition (-transpose or
-xy). In addition, some canned concatenations are
available: -rotate90 or -ccw is equivalent to
-transpose -topbottom; -rotate270 or
-cw is equivalent to -transpose -leftright;
and -rotate180 is equivalent to -leftright
All flags can
be abbreviated to their shortest unique prefix.
1989 by Jef Poskanzer.