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如何在此脚本中添加 while 循环以再次仅运行 case 语句？

tag-icon • tag-icon linux bash
如何在此脚本中添加 while 循环以再次仅运行 case 语句？

这是我正在为我的 Linux 课程编写的脚本。我想添加一个 while 循环来重新运行 case 语句=。任何帮助将不胜感激。这是我的脚本

#!/bin/bash
DATE=$(date -d "$1" +"%m_%d_%Y");

clear

echo -n  " Have you finished everything?"
read response
if [ $response = "Y" ] || [ $response = "y" ]; then 

echo "Do you want a cookie?"

exit 

elif [ $response = "N" ] || [ $response = "n" ]; then 

echo "1 - Update Linux debs"

echo "2 - Upgrade Linux"

echo "3 - Backup your Home directory"

read answer 

case $answer in 

1) echo "Updating!"

    sudo apt-get update;;

2) echo "Upgrading!"

    sudo apt-get upgrade;;

3) echo "Backing up!"

    tar -cvf backup_on_$DATE.tar /home;;

esac

echo "Would you like to choose another option?"

read condition
fi

答案1

while true; do
  #your code
  #break to break the infinite loop
  break
done

答案2

我知道您正在为一堂课这样​​做，而且我知道最近有人谈论不仅仅是给出纯粹的答案，而是尝试帮助引导用户自己发现正确的答案。这通常是通过问题形式的评论来完成的（又名苏格拉底方法）。我发现这种方法有点过于迂回，因为答案应该只是——一个答案——和一个满的答案不够模糊，不会让刚接触问题的用户感到困惑。

如果您正在寻找一种专门重复使用您的case语句的方法，那么这不是您的答案。但是，如果您愿意使用纯if/else逻辑和一些方法以另一种方法来解决此问题functions，那么我建议这样做：

#!/bin/bash
# try to refrain from setting variables in all-caps,
# which could possibly override default shell environment variables
# not exactly sure why you're passing an argument to date here,
# but that's beside the point. For my own purposes, I will comment it out
# and just make the variable of today's date
# DATE="$(date -d "$1" +"%m_%d_%Y")"
date="$(date +%m_%d_%Y)"
clear

# read -p prompts for user input and then sets the response as a variable
read -p "Have you finished everything? [y/n] " response

# with single brackets, you can use the -o flag to represent "or"
# without having to include additional conditional brackets
if [ "$response" = "Y" -o "$response" = "y" ]; then
  echo "Do you want a cookie?"
  exit
elif [ "$response" = "N" -o "$response" = "n" ]; then
  echo "1 - Updadate Linux Debs"
  echo "2 - Upgrade Linux"
  echo "3 - Backup your Home directory"
else
  echo error.
  exit
fi

do_stuff() {
  read -p "Choose an option: [1-3] " answer
  if [[ $answer = 1 ]]; then
    echo "Updating!"
    sudo apt-get update
  elif [[ $answer = 2 ]]; then
    echo "Upgrading!"
    sudo apt-get upgrade
  elif [[ $answer = 3 ]]; then
    echo "Backing up!"
    tar -cvf "backup_on_${date}.tar" /home
  else
    echo error.
    exit
  fi
  do_again
}

do_again() {
  read -p "Would you like to choose another option? [y/n] " condition
  if [ "$condition" = "y" -o "$condition" = "Y" ]; then
    do_stuff
  else
    echo goodbye.
    exit
  fi
}

do_stuff

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