(a2ps.info)The Options Have Changed

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10.3.2 Why Have the Options Changed?
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     The options of this a2ps are not the same as in the previous
     versions.

   True.  But the old scheme (up to version 4.6.1) prevented us from
offering more options.  We *had* to drop it, and to fully redesign the
options handling.

   Since that profound change, we try to change as little as possible
between versions.  Nevertheless, as the time passes, we discover that
some never used options should be renamed, or used for something else.
In these cases, compatibility code is left for a long time.

   Anywhere you put options but the command line (e.g., in a2ps
configuration files or in shell scripts), *avoid using short options*,
since short options are much more likely to be changed (there are not so
many, so it is a precious resource).  Since there are as many long
options as one wants, we can leave compatibility code with the long
options.