The Hugs 98 User's Guide
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# 2.4. Miscellaneous commands

:! [`command`]

  Shell escape. If the `command` is omitted, run a shell.

:cd `dir`

  Change the working directory of Hugs to `dir`. If `dir` begins with "`~/`", the "`~`" is replaced by your home directory.

:gc

  Force a garbage collection.

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