git: undo all working dir changes including new files

git reset --hard # removes staged and working directory changes

## !! be very careful with these !!
## you may end up deleting what you don't want to
## read comments and manual.
git clean -f -d # remove untracked
git clean -f -x -d # CAUTION: as above but removes ignored files like config.
git clean -fxd :/ # CAUTION: as above, but cleans untracked and ignored files through the entire repo (without :/, the operation affects only the current directory)

To see what will be deleted before-hand, without actually deleting it, use the -n flag (this is basically a test-run). When you are ready to actually delete, then remove the -n flag:

git clean -nfd

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