如何停止并强制用户在bash脚本中输入特定值? [英] How to stop and force user to enter specific values in bash script?

问题描述

我正试图迫使用户在bash脚本中输入特定的值，但是它没有提示，有人可以建议吗?

I'm trying to force user to enter specific values in bash scripting, but it does not prompt, can someone advice?

while IFS= read -r line;
do
until [ "$CONTINUE_EXECUTION" = "Y" -o "$CONTINUE_EXECUTION" = "N" ]; do
  echo "Please press Y to continue or N to exit"
  read CONTINUE_EXECUTION
done
echo $line
done < xx2.txt

推荐答案

脚本中的问题是 read -r行和 read CONTINUE_EXECUTION 从xx2.txt读取文件.现在， stdin 映射到 xx2.txt ，并且两个 read 都从那里获取输入.

The problem in your script is both read -r line and read CONTINUE_EXECUTION reads from xx2.txt file. The stdin is now mapped to xx2.txt and both read takes input from there.

一种方法是使用 exec 创建一个新的fd，然后使用 read -u 从该fd中读取.

One way is to use exec to create a new fd and use read -u to read from that fd.

exec 5<xx2.txt
while read -u 5 line   # read from xx2.txt
do
until [ "$CONTINUE_EXECUTION" = "Y" -o "$CONTINUE_EXECUTION" = "N" ]; do
  read -p "Please press Y to continue or N to exit: " CONTINUE_EXECUTION  
       # read from stdin, which is the user's terminal at this point
done
echo $line
CONTINUE_EXECUTION=""
done

PS:因为我想解释所需更改的主要部分，所以我删除了部分代码，例如 IFS .

PS: I have removed few parts of your code like IFS since i wanted to explain the main part of the required change.

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