Jens Jens - 2 years ago 115
Bash Question

Portable getopt_long equivalent for use in shell scripting

I would like to parse long options in a shell script. POSIX only provides

to parse single letter options. Does anyone know of a portable (POSIX) way to implement long option parsing in the shell? I've looked at what
does when generating
scripts, but the result is far from elegant. I can live with accepting only the full spellings of long options. Single letter options should still be allowed, possibly in groups.

I'm thinking of a shell function taking a space separated list of args of the form option[=flags], where the flags indicate that the option takes an arg or can be specified multiple times. Unlike its C counterpart there is no need to distinguish between strings, integers and floats.

Answer Source

Design notes towards a portable shell getopt_long command

I have a program getoptx which works with single-letter options (hence it is not the answer to your problem), but it handles arguments with spaces correctly, which the original getopt command (as opposed to the shell built-in getopts) does not. The specification in the source code says:

** Usage: eval set -- $(getoptx abc: "$@")
**        eval set -- $(getoptx abc: -a -c 'a b c' -b abc 'd e f')
** The positional parameters are:
** $1 = "-a"
** $2 = "-c"
** $3 = "a b c"
** $4 = "-b"
** $5 = "--"
** $6 = "abc"
** $7 = "d e f"
** The advantage of this over the standard getopt program is that it handles
** spaces and other metacharacters (including single quotes) in the option
** values and other arguments.  The standard code does not!  The downside is
** the non-standard invocation syntax compared with:
**        set -- $(getopt abc: "$@")

I recommend the eval set -- $(getopt_long "$optspec" "$@") notation for your getopt_long.

One major issue with getopt_long is the complexity of the argument specification — the $optspec in the example.

You may want to look at the notation used in the Solaris CLIP (Command Line Interface Paradigm) for the notation; it uses a single string (like the original getopt() function) to describe the options. (Google: 'solaris clip command line interface paradigm'; using just 'solaris clip' gets you to video clips.)

This material is a partial example derived from Sun's getopt_clip():


Example 2: Check Options and Arguments.

The following example parses a set of command line options and prints
messages to standard output for each option and argument that it

This example can be expanded to be CLIP-compliant by substituting the
long string for the optstring argument:

While not encouraged by the CLIP specification, multiple long-option
aliases can also be assigned as shown in the following example:



static const char *arg0 = 0;

static void print_help(void)
    printf("Usage: %s [-a][-b][-V][-?][-f file][-o file][path ...]\n", arg0);
    printf("Usage: %s [-ascii][-binary][-version][-in-file file][-out-file file][path ...]\n", arg0);

static const char optstr[] =

int main(int argc, char **argv)
    int c;
    char *filename;

    arg0 = argv[0];
    while ((c = getopt_clip(argc, argv, optstr)) != -1)
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