How do I delete all untracked files from my working directory in Mercurial?

The proper way without purge is:

hg st -un0 | xargs -0 rm

Add the Mercurial Extension called purge. It is distributed by Mercurial.

This extension adds a “purge” command to “hg” that removes files not known to Mercurial. i.e. untracked Files. So your command would be,

hg purge

It is not enabled by default, maybe to avoid accidentally removing files that you forgot to add.

To install this extension, add this to your mercurial settings file (.hgrc on Unix, Mercurial.ini on Windows)

[extensions]
purge = 

To enable this extension temporarily you can use

hg purge --config extensions.purge=