茄子在线看片免费人成视频,午夜福利精品a在线观看,国产高清自产拍在线观看,久久综合久久狠狠综合

這篇文章主要介紹了Shell腳本傳遞參數(shù)的3種方法比較,本文直接給出代碼示例,在代碼中包含詳細(xì)注解,需要的朋友可以參考下

#!/bin/bash

#extracting command text_text_text_line options as parameters

help_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_info

fi

nomal_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命令自建的選項解析，可以按照自己的想法實(shí)現(xiàn)

#優(yōu)點(diǎn)：自己定制，沒有做不到，只有想不到

#缺點(diǎn)：麻煩

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命令解析選項和參數(shù)

#優(yōu)點(diǎn)：相對與getopts來說是個半自動解析，自動組織選項和參數(shù)，用 -- 符號將選項與參數(shù)隔開

#缺點(diǎn)：相對于getopts的缺點(diǎn)

#1.需要與set -- 命令配合，不是必須，需要手動shift

#2.選項參數(shù)中不支持空格如 -a -b dog -c "earth moon" -d -f param1 param2 就會解析錯誤

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 命令解析選項和參數(shù)

#優(yōu)點(diǎn)：可在參數(shù)中包含空格如：-c "earth moon"

# 選項字母和參數(shù)值之間可以沒有空格如：-bdog

# 可將未定義的選項綁定到?輸出

# Unknow option: ?

nomal_opts_act -a -b dog -c earth -d -f param1 param2

getopts_act -a -b dog -c "earth moon" -d -f param1 param2

getopt_act -a -b dog -c earth -d -f param1 param2

更多信息請查看IT技術(shù)專欄