linux shell命令行选项与参数用法详解

# note the quotes around `$temp': they are essential!
#set 会重新排列参数的顺序，也就是改变$1,$2...$n的值，这些值在getopt中重新排列过了
eval set -- "$temp"
#经过getopt的处理，下面处理具体选项。
while true ; do
        case "$1" in
                -a|--a-long) echo "option a" ; shift ;;
                -b|--b-long) echo "option b, argument `$2'" ; shift 2 ;;
                -c|--c-long)
                        # c has an optional argument. as we are in quoted mode,
                        # an empty parameter will be generated if its optional
                        # argument is not found.
                        case "$2" in
                                "") echo "option c, no argument"; shift 2 ;;
                                *)  echo "option c, argument `$2'" ; shift 2 ;;
                        esac ;;
                --) shift ; break ;;
                *) echo "internal error!" ; exit 1 ;;
        esac
done
echo "remaining arguments:"
for arg do
   echo '--> '"`$arg'" ;
done
运行命令：

./getopt.sh --b-long abc -a -c33 remain
option b, argument `abc'
option a
option c, argument `33'
remaining arguments:
--> `remain'
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