如何在Bash中检查文件是否为空？ [英] How to check if a file is empty in Bash?

问题描述

我有一个名为diff.txt的文件。想检查它是否为空。做过这样的事情却无法正常工作。

I have a file called diff.txt. Want to check if it is empty. Did something like this but couldn't get it working.

if [ -s diff.txt ]
then
        touch empty.txt
        rm full.txt
else
        touch full.txt
        rm emtpy.txt
fi

推荐答案

拼写错误很刺激，不是吗？检查你的空的拼写，但是也可以试试这个：

Misspellings are irritating, aren't they? Check your spelling of empty, but then also try this:

#!/bin/bash -e

if [ -s diff.txt ]
then
        rm -f empty.txt
        touch full.txt
else
        rm -f full.txt
        touch empty.txt
fi

我非常喜欢shell脚本，但是它的一个缺点是，当你拼错时，shell无法帮助你，而像你的C ++编译器这样的编译器可以帮助你。

I like shell scripting a lot, but one disadvantage of it is that the shell cannot help you when you misspell, whereas a compiler like your C++ compiler can help you.

顺便提一下，我已经交换了 empty.txt 和 full.txt 的角色，正如@Matthias所建议的那样。

Notice incidentally that I have swapped the roles of empty.txt and full.txt, as @Matthias suggests.

这篇关于如何在Bash中检查文件是否为空？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！