(a2ps.info)Structure of the Escapes

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3.2.2 General Structure of the Escapes
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All format directives can also be given in format

   ESCAPE WIDTH DIRECTIVE

where
ESCAPE
     In general
     '%'
          escapes are related to general information (e.g., the current
          date, the user's name etc.),

     '#'
          escapes are related to the output (e.g., the output file name)
          or to the options you gave (e.g., the number of virtual pages
          etc.), or to special constructions (e.g., enumerations of the
          files, or tests etc.),

     '$'
          escapes are related to the current input file (e.g., its name,
          its current page number etc.),

     '\'
          introduces classical escaping, or quoting, sequences (e.g.,
          '\n', '\f' etc.).

WIDTH
     Specifies the width of the column to which the escape is printed.
     There are three forms for WIDTH
     '+PADDINGINTEGER'
          the result of the expansion is prefixed by the character
          PADDING so that the whole result is as long as INTEGER.  For
          instance '$+.10n' with a file name '$n'='foo.c' gives
          '.....foo.c'.

          If no PADDING is given, ' ' (white space) is used.

     '-PADDINGINTEGER'
          Idem as above, except that completion is done on the left:
          '$+.10n' gives 'foo.c.....'.

     'INTEGER'
          which is a short cut for '+INTEGER'.  For example, escape
          '$5P' will expand to something like '   12'.

DIRECTIVE
     Note: Available Escapes.