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A package of language independent tools that indexes program identifiers, literal numbers, or words of human-readable text. Through an "ID database," a binary file containing a list of filenames, a list of tokens, and a simple matrix indicating which tokens appear in which files, text-searching tasks become simpler and faster. The ID utilities handle more than just identifiers; they also treat other kinds of tokens, including numeric constants, and the contents of certain character strings. Database queries can be issued from the command-line, or from within emacs, serving as an augmented tags facility. Programs included are:
mkid: (id-utils)mkid invocation. Creating an ID database.

  • lid: (id-utils)lid invocation. Matching words and patterns.
  • fid: (id-utils)fid invocation. Listing a file's tokens.
  • fnid: (id-utils)fnid invocation. Looking up file names.
  • xtokid: (id-utils)xtokid invocation. Testing mkid scanners.


User manual included

Heckert gnu.small.png This is a GNU package:idutils


Download version 4.6 (stable)
released on 3 February 2012

VCS Checkout



LicenseVerified byVerified onNotes
GPLv3genium6 September 2015

Leaders and contributors

Pedro J. Ruiz Lopez Maintainer
Jim Meyering Contributor

Resources and communication

Audience Resource type URI
Bug Tracking E-mail
Developer VCS Repository Webview

Software prerequisites

This entry (in part or in whole) was last reviewed on 6 September 2015.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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