Shell脚本传递参数的3种方法比较

#！/bin/bash#extracting command text_text_text_line options as parametershelp_info（）{echo "NAME"echo "	$0"echo "SYNOPSIS"echo "	$0 is a shell test about process options"echo "DESCRIPTION"echo "	option like -a -b param1 -c param2 -d"}if [ $# -lt 0 ]thenhelp_infofinomal_opts_act（）{echo -e "
### nomal_opts_act ###
"while [ -n "$1" ]docase "$1" in -a）echo "Found the -a option";;-b）echo "Found the -b option"echo "The parameter follow -b is $2" shift;;-c）echo "Found the -c option"echo "The parameter follow -c is $2"shift;;-d）echo "Found the -d option";; *） echo "$1 is not an option";;esacshiftdone}#用shell命令自建的选项解析，可以按照自己的想法实现#优点：自己定制，没有做不到，只有想不到#缺点：麻烦getopt_act（）{echo -e "
### getopt_act ###
"GETOPTOUT=`getopt ab:c:d "$@"`set -- $GETOPTOUT while [ -n "$1" ] docase $1 in -a）echo "Found the -a option";;-b）echo "Found the -b option"echo "The parameter follow -b is "$2""shift;;-c）echo "Found the -c option"echo "The parameter follow -c is "$2""shift;;-d）echo "Found the -d option";;--）shiftbreak;; *） echo "Unknow option: "$1"";;esacshiftdoneparam_index=1for param in "$@"doecho "Parameter $param_index:$param"param_index=$[ $param_index + 1 ] done}#用getopt命令解析选项和参数#优点：相对与getopts来说是个半自动解析，自动组织选项和参数，用 -- 符号将选项与参数隔开#缺点：相对于getopts的缺点#1.需要与set -- 命令配合，不是必须，需要手动shift#2.选项参数中不支持空格如 -a -b dog -c "earth moon" -d -f param1 param2 就会解析错误getopts_act（）{echo -e "
### getopts_act ###
"while getopts :ab:c:d ARGSdocase $ARGS in a）echo "Found the -a option";;b）echo "Found the -b option"echo "The parameter follow -b is $OPTARG";;c）echo "Found the -c option"echo "The parameter follow -c is $OPTARG";;d）echo "Found the -d option";; *） echo "Unknow option: $ARGS";;esacdoneshift $[ $OPTIND -1 ] param_index=1for param in "$@"doecho "Parameter $param_index:$param"param_index=$[ $param_index + 1 ] done}#getopts 命令解析选项和参数#优点：可在参数中包含空格如：-c "earth moon"#选项字母和参数值之间可以没有空格如：-bdog#可将未定义的选项绑定到?输出#Unknow option: ?nomal_opts_act -a -b dog -c earth -d -f param1 param2getopts_act -a -b dog -c "earth moon" -d -f param1 param2getopt_act -a -b dog -c earth -d -f param1 param2