acked by Mercurial

Delete files not known to Mercurial. This is useful to test local
and uncommitted changes in an otherwise-clean source tree.

This means that purge will delete the following by default:

- Unknown files: files marked with "?" by :hg:`status`
- Empty directories: in fact Mercurial ignores directories unless
  they contain files under source control management

But it will leave untouched:

- Modified and unmodified tracked files
- Ignored files (unless -i or --all is specified)
- New files added to the repository (with :hg:`add`)

The --files and --dirs options can be used to direct purge to delete
only files, only directories, or both. If neither option is given,
both will be deleted.

If directories are given on the command line, only files in these
directories are considered.

Be careful with purge, as you could irreversibly delete some files
you forgot to add to the repository. If you only want to print the
list of files that this program would delete, use the --print
option.
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