在herdoc内的源代码bash脚本中逐行读取文件

我有两个脚本。脚本A包括脚本B并调用脚本B中的函数

设置如下所示：

测试文件-~/file.txt

one==1.0.0
two==2.0.0
three==3.0.0
four==4.0.0

脚本A-~/Script\u A.sh

#!/bin/bash
source script_b.sh
func_one

#!/bin/bash
# Note: don't forget to change the spaces to tabs else heredoc won't work
my_user=$USER
func_two() {
    # Here, I need run everything in the heredoc as user $my_user
    sudo su - $my_user -s /bin/bash <<- EOF            
        while read -r line || [[ -n "$line" ]];
        do
            # **This is the problem line**
            # I can confirm that all the lines are being 
            #  read but echo displays nothing
            echo "$line"
            # The line below will be printed 4 times as there are 4 lines in the file of interest
            echo "Test"
        done < "/home/$my_user/file.txt"
    EOF
}

func_one() {
    func_two
}

脚本B-~/Script_B.sh

#!/bin/bash
source script_b.sh
func_one

#!/bin/bash
# Note: don't forget to change the spaces to tabs else heredoc won't work
my_user=$USER
func_two() {
    # Here, I need run everything in the heredoc as user $my_user
    sudo su - $my_user -s /bin/bash <<- EOF            
        while read -r line || [[ -n "$line" ]];
        do
            # **This is the problem line**
            # I can confirm that all the lines are being 
            #  read but echo displays nothing
            echo "$line"
            # The line below will be printed 4 times as there are 4 lines in the file of interest
            echo "Test"
        done < "/home/$my_user/file.txt"
    EOF
}

func_one() {
    func_two
}

---

问题：为什么行

回送“$line”

不产生任何输出？

问题是bash在传递给su之前用它的值替换了

$line

。摆脱美元符号应该可以解决这个问题。因此，脚本中的两个位置都应将

$line

更改为

\$line

。

如何确认所有行都已读取？如果在您担心的行上方添加行

回显测试

，您会得到任何输出吗？@iBug I

回显

沿我想要的行显示一个简单文本，并打印相同的次数由于文件中有行。@jwpfox For

echo“test”

，

test

的打印次数与感兴趣的文件中有行的打印次数相同。您能制作一个我们可以测试的文件吗？不需要“迷你康达”的东西，不管是什么？如果您不断地从脚本中删除复杂性，那么在什么情况下它的行为会像您期望的那样？