在bash中逐行读取文件backword [英] Read a file backwords line by line in bash

问题描述

我需要从头开始逐行读取文件.我尝试了tac，但是它像cat一样工作，我想逐行访问它.

I need to read my file line by line from the end. I tried tac but that works like cat and I want to access it line by line.

有没有办法在bash中做到这一点?

Is there a way to do that in bash?

推荐答案

您可以将tac ...与while循环一起使用:

You can use tac... together with a while loop:

while IFS= read -r line
do
   echo "line is: $line"
done < <(tac file)

测试

$ seq 5 > a
$ while IFS= read -r line; do echo "line is: $line"; done < <(tac a)
line is: 5
line is: 4
line is: 3
line is: 2
line is: 1

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