CTAGS(1)                                                 CTAGS(1)



     NAME
          ctags - maintain a tags file for a C program

     SYNOPSIS
          ctags [ -a ] [ -u ] [ -w ] [ -x ] name ...

     DESCRIPTION
          Ctags makes a tags file for ex(1) and vi(1) from the
          specified C, Fortran, and Pascal sources.

          A tags file gives the locations of specified objects (in
          this case functions) in a group of files.  Each line of the
          tags file contains the function name, the file in which it
          is defined, and a scanning pattern used to find the function
          definition.  These are given in separate fields on the line,
          separated by blanks or tabs.  Using the tags file, ex can
          quickly find these function definitions.

        Options
          The -a option causes the output to be appended to the tags
          file instead of rewriting it.

          The -u option causes the specified files to be updated in
          tags, that is, all references to them are deleted, and the
          new values are appended to the file.  This option implies
          the -a option.  (Beware:  this option is implemented in a
          way which is rather slow; it is usually faster to simply
          rebuild the tags file.)

          The -w option suppresses warning diagnostics.

          If the -x flag is given, ctags produces a list of function
          names, the line number and file name on which each is
          defined, as well as the text of that line and prints this on
          the standard output.

          Files whose name ends in ".c" or ".h" are assumed to be C
          source files and are searched for C routine and macro
          definitions.

          The tag main is treated specially in C programs.  The tag
          formed is created by prepending "M" to the name of the file,
          with a trailing ".c" removed, if any, and leading pathname
          components also removed.  This makes use of ctags, practical
          in directories with more than one program.

     EXAMPLE
               ctags *.c *.h

          puts the tags from all the ".c" and ".h" files into the
          tagsfile "tags".




     Page 1                                        (last mod. 8/20/87)

     CTAGS(1)                                                 CTAGS(1)



     FILES
          tags     output tags file

     SEE ALSO
          ex(1), vi(1).

     AUTHOR
          Ken Arnold

     ORIGIN
          4th Berkeley Software Distribution












































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