一个关机重启相关的shell脚本有错误，求解释。。。

5786chenyan

自己写了一个关机重启相关的shell脚本，可以运行总是有错误，偶是初学的，也发现不了错误在哪里，以下是shell源代码，求高手解释。。。。。。。



#!/bin/bash
#Program:
#    For shut down
#History:
#    2012/02/29 ChenYan First release
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export Path
###########
echo "*******************************************"
echo "**This is a shutdown operating procedures**"
echo "******Please select your of operation******"
echo "***1 Restart          2 shutdown***"
echo "***3 Timing shutdown  4 exit******"
echo "*******************************************"

read -p "Please input options:"sel
clear
read -p "are you sure your choice?(Y/N) "sur
if [ $sur == "N" -o $sur == "n"];then
    exit 1

elif[ $sur == "Y" -o $sur == "y"];then
    exit 0;

    case $sel in
    "1")
      ord='shutdown -r now'
      ;;
    "2")
      ord='shutdown -h now'
      ;;
    "3")
      ord='shutdown -h -t $mm'
      ;;
    "4")
     read -p "Are you sure you want to give up the operation?(Y/N)" sur2
     if [ $sur2 == "Y" -o $sur2 == "y" ];then
         exit 0
     elif [ $sur2 == "N" -o $sur2 == "n"];then
         exit 1
     fi
     ;;
     esac
else
    echo "I don't know what's your menu......"
    exit 1;
fi

chenyx

报错信息是什么

splendid12

#!/bin/bash
#Program:
#    For shut down
#History:
#    2012/02/29 ChenYan First release
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export Path
###########
echo "*******************************************"
echo "**This is a shutdown operating procedures**"
echo "******Please select your of operation******"
echo "***1 Restart          2 shutdown***"
echo "***3 Timing shutdown  4 exit******"
echo "*******************************************"

clear    #建议（这意味着你可以坚持你的），之前加个 clear 吧，清屏么

read -p "Please input options:" sel    #加空格
clear
read -p "are you sure your choice?(Y/N) " sur    #加空格
if [ $sur == "N" -o $sur == "n" ] ; then    #加空格
    exit 1   

elif [ $sur == "Y" -o $sur == "y" ] ; then    #加空格
    exit 0;    #此处逻辑错误，上面已经 有 exit 了，这里还有，就是说，无论输入 y n ，都会执行 exit x，exit 就是退出了，所以这句 dd 掉

    case $sel in
    "1")
      ord='shutdown -r now'
      ;;
    "2")
      ord='shutdown -h now'
      ;;
    "3")
      ord='shutdown -h -t $mm'
      ;;
    "4")
     read -p "Are you sure you want to give up the operation?(Y/N)" sur2   
     #一个风格的建议（意味着你可以坚持你自己的），这句英文太生硬，可以改为 quit?
     if [ $sur2 == "Y" -o $sur2 == "y" ] ; then    #加空格
         exit 0
     elif [ $sur2 == "N" -o $sur2 == "n" ] ; then    #加空格
         exit 1    #逻辑错误，n 即不想退出，所以应该重新进行选择，这里可以写成这样： . `pwd`/$0     
     fi
     ;;
     esac
else
    echo "I don't know what's your menu......"
    exit 1;
fi

总体说明：
1）错误处在 if [ ] ; then 的空格为问题上；
2）程序输入的 y n 太多了，让人使用得很不舒服（个人感觉）；
3）总体挺好的。

minzeliu

:wink::wink:

bsechr

不懂帮顶

5786chenyan

回复 3# splendid12
如您所说，我改成下面的样子了，但不管执行哪个选项都会退出，又变成[root@localhost script]_,请问这是怎么回事啊？？你那里测试能用吗？
#!/bin/bash
#Program:
#    For shut down
#History:
#    2012/02/29 Yu First release
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
###########
echo "*******************************************"
echo "**This is a shutdown operating procedures**"
echo "******Please select your of operation******"
echo "***1 Restart          2 shutdown***"
echo "***3 Timing shutdown  4 exit******"
echo "*******************************************"

read -p "Please input options:" sel
clear
read -p "are you sure your choice?(Y/N) " sur
if [ $sur == "N" -o $sur == "n" ]; then
    exit 1

elif [ $sur == "Y" -o $sur == "y" ]; then
    exit 0;
    case $sel in
    "1")
      ord='shutdown -r now'
      ;;
    "2")
      ord='shutdown -h now'
      ;;
    "3")
      ord='shutdown -h -t $mm'
      ;;
    "4")
     read -p "quit?(Y/N)" sur2
     if [ $sur2 == "Y" -o $sur2 == "y" ]; then
         exit 0
     elif [ $sur2 == "N" -o $sur2 == "n"]; then
         . 'pwd'/$0
     fi
     ;;
     esac
else
    echo "I don't know what's your menu......"
    exit 1;
fi