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ctags(1)							      ctags(1)

Name
       ctags - create a tags file

Syntax
       ctags [options] name...

Description
       The command makes a tags file for from the specified C, Pascal and For‐
       tran 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 tags file, can quickly find these objects definitions.

       If  the	-x  flag is given, writes to standard output a list containing
       each object name, its line  number,  the	 file  name  in	 which	it  is
       defined,	 and  the text of the line.  This list is a simple index which
       can be printed out as an off-line readable function index.

Options
       -a		   Appends information to an existing tags file.

       -B		   Uses backward search patterns (?...?).

       -F		   Uses forward search patterns (/.../) (default).

       -t		   Creates typedef tags.

       -u		   Updates the specified tags file.  All references to
			   tags	 are  deleted, and the new values are appended
			   to the file.	 Note that this option is  implemented
			   in  a  way  which  is  rather  slow.	 It is usually
			   faster to simply rebuild the tags file.)

			   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  practical	 in  directories  with
			   more than one program.

       -v		   Generates  an  index	 listing  function  name, file
			   name, and pages number.  Since the output  will  be
			   sorted  into lexicographic order, it may be desired
			   to run the output through sort -f.  For example,
			   ctags -v files | sort -f > 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 look‐
			   ing for C definitions.

       -w		   Suppresses  warning	diagnostics  and  generates  a
			   listing file.  This list contains each object name,
			   its	line  number,  the  file  name	in which it is
			   defined, and the text of the line, and is identical
			   to the list produced when no options are given.

       -x		   Writes  to  standard	 output a list containing each
			   object name, its line  number,  the	file  name  in
			   whcih it is defined, and the text of the line.

Restrictions
       Recognition  of	functions,  subroutines and procedures for FORTRAN and
       Pascal do not deal with block structure.	 Therefore you cannot have two
       Pascal procedures in different blocks with the same name.

       Does not know about #ifdefs.

       Does  not  know	about  Pascal  types.	Relies on the input being well
       formed to detect typedefs.  Use of -tx shows  only  the	last  line  of
       typedefs.

Files
       tags	 output tags file

See Also
       ex(1), vi(1)

								      ctags(1)
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