Usage: ctags [options] [[regex-option ...] file-name] ...

These are the options accepted by ctags.
You may use unambiguous abbreviations for the long option names.
  A - as file name means read names from stdin (one per line).
Absolute names are stored in the output file as they are.
Relative ones are stored relative to the output file's directory.

-a, --append
        Append tag entries to existing tags file.
--packages-only
        For Ada files, only generate tags for packages.
-B, --backward-search
        Write the search commands for the tag entries using '?', the
        backward-search command instead of '/', the forward-search command.
--declarations
	In C and derived languages, create tags for function declarations,
	and create tags for extern variables if --globals is used.
-d, --defines
        Create tag entries for C #define constants and enum constants, too.
-l LANG, --language=LANG
        Force the following files to be considered as written in the
	named language up to the next --language=LANG option.
--globals
	Create tag entries for global variables in some languages.
--members
	Create tag entries for members of structures in some languages.
-r REGEXP, --regex=REGEXP or --regex=@regexfile
        Make a tag for each line matching a regular expression pattern
	in the following files.  {LANGUAGE}REGEXP uses REGEXP for LANGUAGE
	files only.  REGEXFILE is a file containing one REGEXP per line.
	REGEXP takes the form /TAGREGEXP/TAGNAME/MODS, where TAGNAME/ is
	optional.  The TAGREGEXP pattern is anchored (as if preceded by ^).
	If TAGNAME/ is present, the tags created are named.
	For example Tcl named tags can be created with:
	  --regex="/proc[ \t]+\([^ \t]+\)/\1/.".
	MODS are optional one-letter modifiers: `i' means to ignore case,
	`m' means to allow multi-line matches, `s' implies `m' and
	causes dot to match any character, including newline.
-R, --no-regex
        Don't create tags from regexps for the following files.
-I, --ignore-indentation
        In C and C++ do not assume that a closing brace in the first
        column is the final brace of a function or structure definition.
-o FILE, --output=FILE
        Write the tags to FILE.
--parse-stdin=NAME
        Read from standard input and record tags as belonging to file NAME.
-t, --typedefs
        Generate tag entries for C and Ada typedefs.
-T, --typedefs-and-c++
        Generate tag entries for C typedefs, C struct/enum/union tags,
        and C++ member functions.
-u, --update
        Update the tag entries for the given files, leaving tag
        entries for other files in place.  Currently, this is
        implemented by deleting the existing entries for the given
        files and then rewriting the new entries at the end of the
        tags file.  It is often faster to simply rebuild the entire
        tag file than to use this.
-v, --vgrind
        Print on the standard output an index of items intended for
        human consumption, similar to the output of vgrind.  The index
        is sorted, and gives the page number of each item.
-x, --cxref
        Like --vgrind, but in the style of cxref, rather than vgrind.
        The output uses line numbers instead of page numbers, but
        beyond that the differences are cosmetic; try both to see
        which you like.
-V, --version
        Print the version of the program.
-h, --help
        Print this help message.
        Followed by one or more `--language' options prints detailed
        help about tag generation for the specified languages.

These are the currently supported languages, along with the
default file names and dot suffixes:
  ada        .ads .adb .ada
  asm        .a .asm .def .inc .ins .s .sa .S .src
  c          .c .h
  c++        .C .c++ .cc .cpp .cxx .H .h++ .hh .hpp .hxx .M .pdb
  c*         .cs .hs
  cobol      .COB .cob
  erlang     .erl .hrl
  forth      .fth .tok
  fortran    .F .f .f90 .for
  html       .htm .html .shtml
  java       .java
  lisp       .cl .clisp .el .l .lisp .LSP .lsp .ml
  lua        .lua .LUA
  makefile   Makefile makefile GNUMakefile Makefile.in Makefile.am
  objc       .lm .m
  pascal     .p .pas
  perl       .pl .pm
  php        .php .php3 .php4
  postscript .ps .psw
  proc       .pc
  prolog     .prolog
  python     .py
  scheme     .oak .sch .scheme .SCM .scm .SM .sm .ss .t
  tex        .bib .clo .cls .ltx .sty .TeX .tex
  texinfo    .texi .texinfo .txi
  yacc       .y .y++ .ym .yxx .yy
  auto
  none
where `auto' means use default language for files based on file
name suffix, and `none' means only do regexp processing on files.
If no language is specified and no matching suffix is found,
the first line of the file is read for a sharp-bang (#!) sequence
followed by the name of an interpreter.  If no such sequence is found,
Fortran is tried first; if no tags are found, C is tried next.
When parsing any C file, a "class" or "template" keyword
switches to C++.
Compressed files are supported using gzip and bzip2.

For detailed help on a given language use, for example,
etags --help --lang=ada.

Report bugs to bug-gnu-emacs@gnu.org