git clean command is used to remove untracked files in the working tree.
To delete all untracked files in the current directory, a safe way is to do 2 steps:
# Step 1, check what files will be deleted.
# -n or --dry-run, show what files will be deleted without actually deleting them.
$ git clean -n -d
# Step2, do actual deleting action.
# Delete untracked files and untracked directories.
# -d, delete untracked dirctories.
# -f, force to delete, if 'clean.requireForce' in Git confiuration is set to false, 'git clean'
# cleans nothing without '-f' option.
$ git clean -f -d
To remove untracked files with or without ignored files:
# Delete only ignored files.
$ git clean -f -X
# Delete untracked files, untracked directories and ignored files.
$ git clean -f -d -x