getopt_long_only - Linux
Overview
getopt_long_only is a versatile command-line option parsing utility that simplifies the processing of long options in shell scripts or C programs. It offers a powerful way to analyze user inputs and extract relevant information for custom commands.
Syntax
getopt_long_only [OPTIONS] [LONGOPTIONS] -- [ARGUMENT]...
Options/Flags
- -q, –quiet: Suppresses error messages.
- -v, –verbose: Prints all option processing messages.
- -?, –help: Displays help message and exits.
- –longoptions: Prints all specified long options and exits.
Examples
# Parse single-letter options
getopt_long_only "a:b:c" "abc:" -- "arg1" "arg2"
# Parse long options with optional arguments
getopt_long_only "--file=" "--exclude=" -- "input.txt" ".txt"
Common Issues
- Missing argument: Ensure all options with arguments have the necessary values.
- Ambiguous options: Avoid using short options that overlap with long options.
- Invalid option: Use the
--longoptions
flag to verify valid options.
Integration
getopt_long_only can be used in shell scripts for advanced option parsing. For example:
#!/bin/bash
while getopt_long_only "n:f:" -- "$@" ; do
case "$1" in
-n) name="$2"; shift 2 ;;
-f) file="$2"; shift 2 ;;
esac
done
echo "Name: $name, File: $file"
Related Commands
- getopt: Parses both short and long options.
- getopts: Parses only single-letter options.
- Linux getopt_long_only man page