用于检查文件名是否存在的while循环 [英] while loop for checking a file name exists or not

问题描述

filename=""
while [[ $filename = "" ]];do
    echo "Enter the file name"
    read filename
    if [[ -f $filename ]];then
        echo "$filename exists"
    else
        echo "File name doesn't exists, so re-enter"
    fi
done

使用这种循环样式，当文件名不存在时循环存在.但我希望循环继续，直到用户输入文件名.请建议我应该在上述脚本中包含哪些附加命令.

with this style of loop, the loop exists when the file name is not present. But i want the loop to continue until the user input the file name. Please suggest what additional command i should include in the above script.

推荐答案

使用break跳出循环

while true ; do
   echo "Enter the file name"
   read filename
   if [ -f "${filename}" ]; then
       echo "${filename} exists"
       break
   else
       echo "File name doesn't exists, so re-enter"
   fi
done
echo "Thanks for ${filename}"

或更短

while true ; do
   read -p "Enter the file name: " filename
   test -f "${filename}" && break
   echo "File name doesn't exists, so re-enter"
done
echo "Thanks for ${filename}"

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