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如果输入丢失则循环程序

tag-icon • tag-icon input output
如果输入丢失则循环程序

我的这个脚本运行得很好，但是如果输入错误，我想重新运行该脚本，该怎么办？

#! /bin/bash
#! userInput - a script that reads in text and outputs it immediately

echo "Would you like to input some text? Y/N"
        read request
if [[ $request = Y ]]; then
        echo "Please input some text"
                read input
        echo $input
elif [[ $request = N ]]; then
        echo "Thank You"
else
        echo "Invalid Input - Please Input Y for yes or N for no"
fi

答案1

这就是select目的。

PS3="Would you like to input some text? <Y/N>   ]"
select choice in "Y" "N"; do
   case $choice in
      "Y")
          echo -n "Please input some text >"
          read input
          echo "$input"
          break
          ;;
      "N")
          echo "Very well."
          break
          ;;
      *)
          echo "Invalid response."
          ;;
    esac
done

答案2

我建议您组织控制流来对您要解决的问题进行建模。你想在用户不想退出时查看，而不是永远查看：

#!/bin/bash

echo -n "Would you like to input some text (Y/N): "
read request

while [[ "${request}" != "N" ]]; do
    if [[ "${request}" == "Y" ]]; then
        echo -n "Please input some text: "
        read input

        echo "You entered '${input}'"
    else
        echo "Invalid input: '${request}'"
    fi

    echo -n "Would you like to input some text (Y/N): "
    read request
done

echo "Thank you"

答案3

怎么样

#!/bin/bash
# userInput - a script that reads in text and outputs it immediately

while true; do
    echo "Would you like to input some text? Y/N"
    read request

    if [[ $request = Y ]]; then
        echo "Please input some text"
        read input
        echo $input
        break
    elif [[ $request = N ]]; then
        echo "Thank You"
        break
    else
        echo "Invalid Input - Please Input Y for yes or N for no"
    fi
done

答案4

否则，如果您确实想重新运行脚本：

else
 exec $0

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