CTAGS(1)            UNIX Programmer's Manual             CTAGS(1)

NAME
     ctags - create a tags file

SYNOPSIS
     ctags [ -BFatuwvx ] name ...

DESCRIPTION
     _C_t_a_g_s makes a tags file for _e_x(1) from the specified C, Pas-
     cal and Fortran sources.  A tags file gives the locations of
     specified objects (in this case functions and typedefs) in a
     group of files.  Each line of the tags file contains the
     object name, the file in which it is defined, and an address
     specification for the object definition. Functions are
     searched with a pattern, typedefs with a line number.
     Specifiers are given in separate fields on the line,
     separated by blanks or tabs.  Using the _t_a_g_s file, _e_x can
     quickly find these objects definitions.

     If the -x flag is given, _c_t_a_g_s produces a list of object
     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.  This is a simple index which can be
     printed out as an off-line readable function index.

     If the -v flag is given, an index of the form expected by
     _v_g_r_i_n_d(1) is produced on the standard output.  This listing
     contains the function name, file name, and page number
     (assuming 64 line pages).  Since the output will be sorted
     into lexicographic order, it may be desired to run the out-
     put through sort -f.  Sample use:
          ctags -v files | sort -f > index
          vgrind -x index

     Files whose name ends in .c or .h are assumed to be C source
     files and are searched for C routine and macro definitions.
     Others are first examined to see if they contain any Pascal
     or Fortran routine definitions; if not, they are processed
     again looking for C definitions.

     Other options are:

     -B   use backward searching patters (?...?).

     -F   use forward searching patterns (/.../) (default).

     -a   append to tags file.

     -t   create tags for typedefs.

     -u   causing the specified files to be _u_p_d_a_t_e_d in tags, that
          is, all references to them are deleted, and the new
          values are appended to the file.  (Beware: this option

Printed 7/22/83                                                 1

CTAGS(1)            UNIX Programmer's Manual             CTAGS(1)

          is implemented in a way which is rather slow; it is
          usually faster to simply rebuild the _t_a_g_s file.)

     -w   suppressing warning diagnostics.

     The tag _m_a_i_n 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 _c_t_a_g_s practical
     in directories with more than one program.

FILES
     tags                output tags file

SEE ALSO
     ex(1), vi(1)

AUTHOR
     Ken Arnold; FORTRAN added by Jim Kleckner; Bill Joy added
     Pascal and -x, replacing _c_x_r_e_f; C typedefs added by Ed
     Pelegri-Llopart.

BUGS
     Recognition of _f_u_n_c_t_i_o_n_s, _s_u_b_r_o_u_t_i_n_e_s and _p_r_o_c_e_d_u_r_e_s for
     FORTRAN and Pascal is done is a very simpleminded way.  No
     attempt is made to deal with block structure; if you have
     two Pascal procedures in different blocks with the same name
     you lose.

     The method of deciding whether to look for C or Pascal and
     FORTRAN functions is a hack.

     Does not know about #ifdefs.

     Should know about Pascal types.  Relies on the input being
     well formed to detect typedefs.  Use of -tx shows only the
     last line of typedefs.

Printed 7/22/83                                                 2