如何处理循环中的每个输出行? [英] How to process each output line in a loop?

问题描述

在运行 grep 命令后，我从文件中检索了许多行如下:

I have a number of lines retrieved from a file after running the grep command as follows:

var=`grep xyz abc.txt`

假设我得到了 10 行包含 xyz 的结果.

Let’s say I got 10 lines which consists of xyz as a result.

现在我需要处理我作为 grep 命令的结果得到的每一行.我该如何处理?

Now I need to process each line I got as a result of the grep command. How do I proceed for this?

推荐答案

一种简单的方法是不将输出存储在变量中，而是直接使用 while/read 循环对其进行迭代.

One of the easy ways is not to store the output in a variable, but directly iterate over it with a while/read loop.

类似于:

grep xyz abc.txt | while read -r line ; do
    echo "Processing $line"
    # your code goes here
done

此方案有多种变化，具体取决于您所追求的内容.

There are variations on this scheme depending on exactly what you're after.

如果您需要更改循环内的变量(并使该更改在循环外可见)，您可以使用 fedorqui 的回答:

If you need to change variables inside the loop (and have that change be visible outside of it), you can use process substitution as stated in fedorqui's answer:

while read -r line ; do
    echo "Processing $line"
    # your code goes here
done < <(grep xyz abc.txt)

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