shell练习题2

需求如下：

写一个shell脚本，检查指定的shell脚本是否有语法错误，若有错误，首先显示错误信息，然后提示用户输入q或Q退出脚本，

输入其他内容则直接用vim打开该shell脚本。

参考解答如下

• 方法1

#!/bin/bash

cmd="/bin/bash"
ed="/usr/bin/vim"

if [ $# -ne 1 ];then
    echo "USAGE:$0 script_name"
    exit 1
fi

$cmd -n $1
if [ $? -ne 0 ];then
    read -p "Please enter Q/q to exit,or other to edit it by vim."
    if [ "$REPLY" = "q" -o "$REPLY" = "Q" ];then
        exit 0
    else
        $ed $1
    fi
else
    echo "The scipt is OK."
fi

• 方法2

#!/bin/bash

cmd="/bin/bash"
ed="/usr/bin/vim"

if [ $# -ne 1 ];then
    echo "USAGE:$0 script_name"
    exit 1
fi

$cmd -n $1 2>/tmp/err
if [ $? -eq 0 ];then
    echo "The script is OK."
else
    cat /tmp/err
    read -p "Please enter Q/q to exit,or other to edit it by vim." n
    if [ -z $n ];then
        $ed $1
        exit
    fi
    if [ "$n" = "q" -o "$n" = "Q" ];then
        exit
    else
        $ed $1
        exit
    fi
fi

注意： bash -n选项只检测语法错误。