The syntax for the untrack command is:
nift untrack names
nsm untrack names
The untrack command is for untracking files from a project, it takes a non-zero number of string parameters that should specify names of files to untrack. All information about the file is removed from .nsm/tracking.list along with the output file and the info file. It is up to you whether you want to manually remove any associated content and/or template files (or alternatively use the del/rm/rmv command).
Note: Surround any names containing spaces with single or double quotes.
Note: untrack-dir and untrack-from-file are much more convenient for untracking large volumes of files than untrack.