[运维Shell脚本小试牛刀(三)::(cd (dirname 0)； pwd)命令详解](https://blog.csdn.net/u014635374/article/details/132579373 "运维Shell脚本小试牛刀(三)::(cd (dirname 0)； pwd)命令详解")
一: if---else.....fi 条件判断演示
root@www shelldic\]# cat checkpass.sh #!/bin/bash - #================================================================================================================== # # # FILE: checkpass.sh # USAGE: ./checkpass.sh # DESCRIPTION: # OPTIONS: ------- # REQUIREMENTS: --------- # # BUGS: ------ # NOTES: -------- # AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com # ORGANIZATION: # CREATED: 2023-8-24 09:11:20 # REVISION: -------- # # # # # #==================================================================================================================== # 显示提示用户输入密码,然后从标准输入隐式地读取用户输入,并将读取的内容赋值给变量pass read -sp "Enter a password: " pass # 如果变量pass的值为laogao,则显示验证通过的信息,然后退出脚本的执行,退出状态码为0 if test "$pass" == "laogao" then echo -e "\\nPasswrod verified" exit 0 fi #退出脚本执行,退出状态码为1 exit 1
root@www shelldic\]# cat multeCheckpass.sh #!/bin/bash - #================================================================================================================== # # # FILE: multeChckepass.sh # USAGE: ./multeCheckpass.sh # DESCRIPTION: 该实例主要是演示if ----else-----fi 根据条件的不同结果可以采取不同的行为 # OPTIONS: ------- # REQUIREMENTS: --------- # # BUGS: ------ # NOTES: -------- # AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com # ORGANIZATION: # CREATED: 2023-8-29 09:11:20 # REVISION: -------- # # # # # #==================================================================================================================== read -sp "请输入登录密码: " pass if \[ "$pass" == "yangge"
then
echo -e "\n你已经通过验证...."
exit 0
else
if [ "$pass"=="yangyangge" ]
then
echo -e "\n你输入的信息为: ${pass}, 你用通过认证....."
else
echo "\n 你输入的密码为：$pass , 该密码错误,你将被拒绝再次访问....."
fi
fi
root@www shelldic\]# cat multeNestecheckcount.sh #!/bin/bash - #================================================================================================================== # # # FILE: multeNestecheckcount.sh # USAGE: ./multeNestechckcount.sh # DESCRIPTION: if----else---fi 多级嵌套 # OPTIONS: ------- # REQUIREMENTS: --------- # # BUGS: ------ # NOTES: -------- # AUTHOR: ---------YangGe (TOM) ,YangGe.freedom@icloud.com # ORGANIZATION: # CREATED: 2023-8-24 09:11:20 # REVISION: -------- # # # # # #==================================================================================================================== # 声明一个变量 declare -i count # 提示用户输入一个数值,然后把该变量存入count变量中 read -p "请输入一个数值: " count if \[ $count -eq 100
then
echo -e "\nyou enter data Count is 100"
else
if [ $count -gt 100 ]
then
echo -e "\nyou enter data count greater than 100."
else
echo -e "\n you enter data count less than 100..."
fi
fi