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A.6.1 File Names

Conventions for file names.

Most files used by Mathematica are completely system independent. .mx and .exe files are however system dependent. For these files, there is a convention that bundles of versions for different computer systems have names with forms such as name/$SystemID/name.
In general, when you refer to a file, Mathematica tries to resolve its name as follows:

  • If the name starts with !, Mathematica treats the remainder of the name as an external command, and uses a pipe to this command.
  • If the name contains metacharacters used by your operating system, then Mathematica passes the name directly to the operating system for interpretation.
  • Unless the file is to be used for input, no further processing on the name is done.
  • Unless the name given is an absolute file name under your operating system, Mathematica will search each of the directories specified in the list $Path.
  • If what is found is a directory rather than a file, then Mathematica will look for a file name/$SystemID/name.

    For names of the form name` the following further translations are done in Get and related functions:

  • A file is used if it exists.
  • A file name.m is used if it exists.
  • If name is a directory, then the file name/init.m is used if it exists.
  • If is a directory, then$SystemID/ is used if it exists.

    In Install, name` is taken to refer to a file or directory named name.exe.