bash getopt

今天看了下bash的getopt, 写了个例子, 记下来。

#!/bin/bash

#
# ./getopt.sh  -c config a b -u   -d "this is desc" --work-dir "/"  --verbose
#

#   function Usage
function Usage {
    echo "Usage:" 1>&2
    echo "    $0 Foo Bar [Option]" 1>&2
    echo "Option:" 1>&2
    echo "    Foo                       The input file." 1>&2
    echo "    Bar                       The output file." 1>&2
    echo "        --help                Display this message and exit." 1>&2
    echo "        --verbose             Verbose mode." 1>&2
    echo "        --work-dir [P]        The working directory." 1>&2
    echo "    -c, --config-file [F]     Set configure file." 1>&2
    echo "    -u, --unk                 Consider unknown words." 1>&2
    echo "    -d, --desc-str [S]        Set description string." 1>&2
    echo "Example:"
    echo "./getopt.sh --config-file /etc/passwd a b --unk --desc-str 'this is a desc str' --work-dir . --verbose";
    exit 1
}
 
#   parse argument
eval set -- "$(getopt -n $0 -o "c:ud:" -l "help,verbose,work-dir:,config-file:,unk,desc-str:" "--" "$@")"
if  [ $? -ne 0 ]
then
    Usage
fi

echo "argv now [$@] [$*]";
echo "begin parse argument........";
for arg
do
    # echo "encounter [$arg]";
    case "$arg" in
       --help)            Usage; shift;;
       --verbose)         verbose=1; shift;;
       --work-dir)        shift; work_dir="$1"; shift;;
       -c|--config-file)  shift; config_file="$1"; shift;;
       -u|--unk)          unk=1;   shift;;
       -d|--desc-str)     shift; desc_str="$1"; shift;;
       --)                shift; break;;
    esac
done
 
#   rest paremeters
if [ $# -lt 2 ]
then
    Usage
fi
input_file="$1"
output_file="$2"

echo "get the following argument:";
echo "----------------------------------------";
echo "verbose         => $verbose";
echo "unk             => $unk";
echo "d|desc-str      => $desc_str";
echo "c|config-file   => $config_file";
echo "verbose         => $verbose";
echo "work-dir        => $work_dir";
echo "input           => $input_file";
echo "output          => $output_file";