Bash readline 在 while 循环中不工作

Question

有一天我试过了，但我还是不明白为什么？ echo 工作正常但如果总是 return false.

#!/bin/sh -e
   scan_fileExists(){
        while read file; do
            echo $file #echo is working
            if [ -f $file ]; then
                echo "Yes"
            fi
        done < 
   }
   scan_fileExists "/home/myfile"

Answer 1

试试这个：

#!/bin/bash -e                               # modified
   scan_fileExists(){
        x=$'\r'                              # added
        while read file; do
            echo $file #echo is working
            if [ -f ${file%${x}*} ]; then    # modified
                echo "Yes"
            fi
        done < 
   }
   scan_fileExists "/home/myfile"

将 sh 保持为 shell 的其他方法（缺点：在子 shell 中作为管道成员运行时）：

#!/bin/sh -e
   scan_fileExists(){
        tr -d "\r" <  | while read file; do  # modified
            echo $file #echo is working
            if [ -f $file ]; then
                echo "Yes"
            fi
        done                                   # modified
   }
   scan_fileExists "/home/myfile"

Bash readline 在 while 循环中不工作

Bash readline not working inside a while loop

linux

bash

scripting

loops

do-while