Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

ident(1)


NAME

   ident - identify RCS keyword strings in files

SYNOPSIS

   ident [ -q ] [ -V ] [ file ... ]

DESCRIPTION

   ident searches for all instances of the pattern $keyword: text $ in the
   named files or, if no files are named, the standard input.

   These patterns are normally inserted automatically by the  RCS  command
   co(1), but can also be inserted manually.  The option -q suppresses the
   warning given if there are no patterns in a file.  The option -V prints
   RCS's version number.

   ident  works  on  text  files  as  well as object files and dumps.  For
   example, if the C program in f.c contains

          #include <stdio.h>
          static char const rcsid[] =
            "$Id: f.c,v 5.4 1993/11/09 17:40:15 eggert Exp $";
          int main() { return printf("%s\n", rcsid) == EOF; }

   and f.c is compiled into f.o, then the command

          ident  f.c  f.o

   will output

          f.c:
              $Id: f.c,v 5.4 1993/11/09 17:40:15 eggert Exp $
          f.o:
              $Id: f.c,v 5.4 1993/11/09 17:40:15 eggert Exp $

   If a C program defines a string like rcsid above but does not  use  it,
   lint(1)  may  complain,  and  some  C  compilers will optimize away the
   string.  The most reliable solution is to  have  the  program  use  the
   rcsid string, as shown in the example above.

   ident  finds  all  instances  of  the $keyword: text $ pattern, even if
   keyword is not actually  an  RCS-supported  keyword.   This  gives  you
   information about nonstandard keywords like $XConsortium$.

   The pattern normally requires a colon and a space immediately after the
   keyword and a space immediately  before  the  terminating  $,  but  for
   Subversion 1.2 (and later) compatibility, ident will also recognize the
   pattern $keyword:: text $ (i.e.,  two  colons  and  a  space)  and  the
   pattern   $keyword:: text #$   (likewise,   with   a  hash  before  the
   terminating  $).   These  are  the  fixed-width  keyword  syntax.    To
   summarize, the three recognized patterns are:

          $keyword: text $
          $keyword:: text $
          $keyword:: text #$

KEYWORDS

   Here  is the list of keywords currently maintained by co(1).  All times
   are given in Coordinated Universal Time (UTC, sometimes called GMT)  by
   default,  but  if  the  files were checked out with co's -zzone option,
   times are given with a numeric time zone indication appended.

   $Author$
          The login name of the user who checked in the revision.

   $Date$ The date and time the revision was checked in.

   $Header$
          A standard  header  containing  the  full  RCS  file  name,  the
          revision  number,  the date and time, the author, the state, and
          the locker (if locked).

   $Id$   Same as $Header$, except that  the  RCS  file  name  is  without
          directory components.

   $Locker$
          The login name of the user who locked the revision (empty if not
          locked).

   $Log$  The log message supplied during checkin.  For ident's  purposes,
          this is equivalent to $RCSfile$.

   $Name$ The symbolic name used to check out the revision, if any.

   $RCSfile$
          The RCS file name without directory components.

   $Revision$
          The revision number assigned to the revision.

   $Source$
          The full RCS file name.

   $State$
          The  state assigned to the revision with the -s option of rcs(1)
          or ci(1).

   co(1) represents the following characters in keyword values  by  escape
   sequences to keep keyword strings well-formed.

          char     escape sequence
          tab      \t
          newline  \n
          space    \040
          $        \044
          \        \\

IDENTIFICATION

   Author: Walter F. Tichy.
   Manual Page Revision: 5.9.4; Release Date: 2015-06-21.
   Copyright  2010-2015 Thien-Thi Nguyen.
   Copyright  1990, 1992, 1993 Paul Eggert.
   Copyright  1982, 1988, 1989 Walter F. Tichy.

SEE ALSO

   ci(1), co(1), rcs(1), rcsdiff(1), rcsmerge(1), rlog(1), rcsfile(5).

   Walter  F. Tichy, RCS--A System for Version Control, Software--Practice
   & Experience 15, 7 (July 1985), 637-654.

   The full documentation for RCS is maintained as a Texinfo  manual.   If
   the  info(1)  and RCS programs are properly installed at your site, the
   command

          info rcs

   should give you access to the complete manual.  Additionally,  the  RCS
   homepage:

          http://www.gnu.org/software/rcs/

   has news and links to the latest release, development site, etc.



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner