exit 0
调用：
$ bash sh05.sh 1a 2b 3c 4d
The script's name is ==> sh05.sh
Total parameter number is ==> 4
The whole parameter is ==> '1a 2b 3c 4d'
The first parameter is ==> 1a
The first parameter is ==> 2b
注：从以上程序可以看出与参数有关的预设变量如何表示
5 条件表达式
5.1 if 结构
# !/bin/bash
# Program:
# This program is used to show if else expression
# History:
# 2013/2/3 on_1y First release
PATH=$PATH
export PATH
read -p "Please input [Y/N]" choice
if [ "$choice" == "Y" ] || [ "$choice" == "y" ];then
echo "OK, continue"
exit 0
fi
if [ "$choice" == "N" ] || [ "$choice" == "n" ];then
echo "Oh, interupt"
exit 0
fi
exit 0
调用：
$ bash sh06.sh
Please input [Y/N]y
OK, continue
$ bash sh06.sh
Please input [Y/N]n
Oh, interupt
5.2 if else 结构
# !/bin/bash
# Program:
# This program is used to show if else expression
# History:
# 2013/2/3 on_1y First release
PATH=$PATH
export PATH
read -p "Please input [Y/N]" choice
if [ "$choice" == "Y" ] || [ "$choice" == "y" ];then
echo "OK, continue"
exit 0
elif [ "$choice" == "N" ] || [ "$choice" == "n" ];then
echo "Oh, interupt"
exit 0
else
echo "Input [Y/N]"
fi
exit 0
5.3 case
# !/bin/bash
# Program:
# This program is used to show case expression
# History:
# 2013/2/3 on_1y First release
PATH=$PATH
export PATH
read -p "Tell me your choice:[1-3]=>" choice
case $choice in
"1")
echo "Your choice is ONE"
"2")
echo "Your choice is TWO"
"3")
echo "Your choice is THREE"
esac
exit 0
调用：
$ bash sh08.sh
Tell me your choice:[1-3]=>2
Your choice is TWO
$ bash sh08.sh
Tell me your choice:[1-3]=>1
Your choice is ONE
$ bash sh08.sh
Tell me your choice:[1-3]=>3
Your choice is THREE
6 函数
# !/bin/bash
# Program:
# This program is used to test function
# History:
# 2013/2/3 on_1y First release
PATH=$PATH
export PATH
function myprint(){
echo -n "Your choice is "
}
read -p "Tell me your choice:[1-3]=>" choice
case $choice in
"1")
myprint;echo "ONE"
