Bash 脚本有助于 if then else 和区分大小写

发布于 2024-09-30 21:38:54 字数 582 浏览 7 评论 0原文

好的，我正在尝试检查文件是否存在，如果存在，则我为用户提供再次下载该文件的选项 - 我希望默认值（输入）为 Y，我希望 Y 或 y 继续脚本，我希望 N 或 n 退出脚本，并且我希望所有其他响应返回并重新提示问题......但我坚持这一点。

我所做的实际上只是继续（输入），并且除了小写 y 之外的所有其他响应都失败。

这里是：

if [ -f $target/$remote_backup ];then
    read -p "This file already exists, do you still want to download? [Y/n]" decide
     if [ -z $decide ];then
        # if you press return it'll default to Y and continue
        decide="Y"
    else
        if [ $decide != y ]; then
        echo "Ok you said no or pressed a random button, exiting"
        exit -1
    fi
fi
fi

原文

Ok I'm trying to have a situation where I check if a file exists, if it does then I give the user the option to download it again - I want the default (enter) to be Y, I want Y or y to continue the script, I want N or n to exit the script, and I want all other responses to go back and re-prompt the question... but I'm stuck on that.

What I've done really just continues on (enter), and fails on all other responses other than lowercase y.

Here it is:

if [ -f $target/$remote_backup ];then
    read -p "This file already exists, do you still want to download? [Y/n]" decide
     if [ -z $decide ];then
        # if you press return it'll default to Y and continue
        decide="Y"
    else
        if [ $decide != y ]; then
        echo "Ok you said no or pressed a random button, exiting"
        exit -1
    fi
fi
fi

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薄荷梦 2024-10-07 21:38:54

通常使用的结构是 case。

case "$decide" in
  y|Y|'') echo "yes" ;;
  n|N) echo "no" ;;
  *) echo "boo" ;;
esac

The usual structure to use for this is case.

case "$decide" in
  y|Y|'') echo "yes" ;;
  n|N) echo "no" ;;
  *) echo "boo" ;;
esac

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无可置疑 2024-10-07 21:38:54

尝试使用 while 循环：

if [ -f $target/$remote_backup ]; then
    decide="?"
    while [ "$decide" != "y" -a "$decide" != "n" ]; do
        read -p "This file already exists, do you still want to download? [Y/n] " decide
        if [ -z $decide ]; then
            decide="y"
        fi
    done
    echo Decision: $decide
fi

Try a while loop:

if [ -f $target/$remote_backup ]; then
    decide="?"
    while [ "$decide" != "y" -a "$decide" != "n" ]; do
        read -p "This file already exists, do you still want to download? [Y/n] " decide
        if [ -z $decide ]; then
            decide="y"
        fi
    done
    echo Decision: $decide
fi

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