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Appendix D Metasymbols

Within this document, the following metasyntactic conventions will be used when discussing command line options, commands, arguments and templates:

n
Argument is not optional and n must be a valid number.
e|t|dvar
Argument is not optional and must be a single alphabetic character.
$tvar
Argument is not optional and must be a single alphabetic character, that is lead by a ‘$’ character.
[text]
Argument is optional and text is a valid string of text.
[ab]
Arguments are optional, any number may be used in any order, e.g.:
          NOTHING, a, b, ab, ba ...

{ab}
Arguments are not optional, minimum one up to any number may be used in any order, e.g.:
          a, b, ab, ba ...

[a|b]
Arguments are optional, select either a or b, but not both.
a|b
Arguments are not optional, select either a or b, but not both.
[a[b]]
Arguments are optional, select either a or ab, but not b.
[a|b[c]]
Arguments are optional, select a or b or ac or bc, but not c.
[a|bc]
Arguments are optional, select either ac or bc, but not a or b or c.
[a]|[b]
Argument lists are optional, select either list a or list b, but not both.
[...]
Additional arguments/files may be specified and are optional.