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getopt [2013/08/27 16:47] |
getopt [2013/08/27 16:47] (current) |
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| + | ====== getopt ====== | ||
| + | * [[bash]] | ||
| + | * [[getopts]] | ||
| + | * [[sh]] | ||
| + | |||
| + | Generally speaking, use ''getopts'' since it is newer and a built-in function of bash. Use ''getopt'' if you are looking for consistency across platforms. | ||
| + | |||
| + | The man page has a good example, but here are some of the basics: | ||
| + | |||
| + | Use **-a:** to requires an argument, either directly after the ''-a'' or with a whitespace first. | ||
| + | |||
| + | <code> | ||
| + | getopt a: $* | ||
| + | </code> | ||
| + | |||
| + | Use **-b** to set a boolean value. | ||
| + | |||
| + | <code> | ||
| + | getopt b $* | ||
| + | </code> | ||
| + | |||
| + | === getopt example === | ||
| + | |||
| + | <code bash> | ||
| + | # Allow -a <arg>, -d and -z | ||
| + | args=`getopt a:vz $*` | ||
| + | |||
| + | # If getopt fails, then throw an error and quit | ||
| + | if [ $? -ne 0 ]; then echo "Usage: ... "; exit 1; fi | ||
| + | |||
| + | # Set the new arguments | ||
| + | set -- $args | ||
| + | |||
| + | while true; do | ||
| + | case "$1" in | ||
| + | -a) | ||
| + | echo "Passed '$2' argument to -a"; shift; shift;; | ||
| + | -v) | ||
| + | echo "Verbose output enabled"; verbose=1; shift;; | ||
| + | -z) | ||
| + | echo "Debug output enabled"; verbose=1; debug=1; shift;; | ||
| + | --) | ||
| + | shift; break;; | ||
| + | esac | ||
| + | done | ||
| + | </code> | ||
