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 "/t$0"  echo "SYNOPSIS"  echo "/t$0 is a shell test about process options"  echo "DESCRIPTION"  echo "/toption like -a -b param1 -c param2 -d"}if [ $# -lt 0 ]then  help_infofinomal_opts_act(){  echo -e "/n### nomal_opts_act ###/n"  while [ -n "$1" ]  do  case "$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 "$1 is not an option"      ;;  esac  shift  done}#用shell命令自建的选项解析，可以按照自己的想法实现#优点：自己定制，没有做不到，只有想不到#缺点：麻烦getopt_act(){  echo -e "/n### getopt_act ###/n"  GETOPTOUT=`getopt ab:c:d "$@"`  set -- $GETOPTOUT   while [ -n "$1" ]   do  case $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"      ;;    --)      shift      break      ;;     *)       echo "Unknow option: "$1""      ;;  esac  shift  done  param_index=1  for param in "$@"  do    echo "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 "/n### getopts_act ###/n"  while getopts :ab:c:d ARGS  do  case $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"      ;;  esac  done  shift $[ $OPTIND -1 ]   param_index=1  for param in "$@"  do    echo "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