gengetopt - manual page for gengetopt 2.23

gengetopt [OPTION]...

This program generates a C function that uses getopt_long function to parse the command line options, validate them and fill a struct.

Print help and exit
Print help, including all details and hidden options, and exit
Print help, including hidden options, and exit
Print version and exit

Main options:

input file (default std input)
name of generated function (default=`cmdline_parser')
name of generated args info struct (default=`gengetopt_args_info')
name of generated file (default=`cmdline')
output directory
if this option is not specified, the files are generated in the current directory.
header output directory
source output directory
extension of c file (default=`c')
extension of header file (default=`h')
long usage line in help
The usage line will print all the options, e.g.,
sample1 -iINT|--int-opt=INT [-h|--help]
by default, an option is considered optional if not specified otherwise
accept options without names (e.g., file names) (default=`FILE')
synonym for --unnamed-opts, accepted for backwards compatibility (default=`FILE')

The parser generated is thought to be used to parse the command line arguments. However, you can also generate parsers for configuration files, or strings that contain the arguments to parse, by using the following two options.

generate a config file parser
generate a string parser (the string contains the command line)

adds the code for getopt_long in the generated C file
do not handle --help|-h automatically
If --no-handle-help is specified, the command line option --help|-h will not be handled automatically, so the programmer will be able to print some other information; then the function for printing the standard help output can be used; this function is called <parser-name>_print_help.
Notice that, although the programmer can handle --help|-h manually, the parser will return after finding such option: the other command line options, if any, will be ignored. In case you want to have full control on --help|-h, you should use --ho-help.
do not add --help|-h automatically
With this option you can disable the automatic addition of options --help|-h. The programmer will then be able to add this option in the input file and handle it as he sees fit. Notice that --no-help will also disable the automatic options --detailed-help and --full-help.
The programmer can still define options with short character h as he wants, but he cannot define options help, unless he specifies --no-help (otherwise an error will be printed).
do not handle --version|-V automatically
do not add --version|-V automatically
See above the details about --no-handle-help and --no-help, respectively.
do not exit on errors
With this option, if the generated parser encounters an error (e.g., an unknown option) it does not make the main program exit; instead, the parser function returns a value different 0, and the main program can print a help message.
in the output of help will specify which options are mandatory, by using the optional passed string (default=`(mandatory)')
completely hide hidden options
put gengetopt version in the generated file (default=on)
set the package name (override package defined in the .ggo file)
set the version number (override version defined in the .ggo file)
show the output of --help instead of generating code
show the output of --full-help (i.e., including hidden options) instead of generating code
show the output of --detailed-help (i.e., including details and hidden options) instead of generating code
show the output of --version instead of generating code

Please refer to the info manual for further explanations.

Maintained by Tomas Volf <>

Report bugs to <>

Copyright © 1999-2011 Free Software Foundation Inc. This program comes with ABSOLUTELY NO WARRANTY; for details please see the file 'COPYING' supplied with the source code.
This is free software, and you are welcome to redistribute it under certain conditions; again, see 'COPYING' for details. This program is released under the GNU General Public License.

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

info gengetopt

should give you access to the complete manual.

June 2019 gengetopt 2.23