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.我想检查它是否为空.

I have a file called diff.txt. I Want to check whether it is empty.

我写了一个类似下面的 bash 脚本，但我无法让它工作.

I wrote a bash script something like below, but I couldn't get it work.

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

推荐答案

拼写错误很烦人，不是吗?检查 empty 的拼写，然后试试这个:

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

#!/bin/bash -e

if [ -s diff.txt ]; then
        # The file is not-empty.
        rm -f empty.txt
        touch full.txt
else
        # The file is empty.
        rm -f full.txt
        touch empty.txt
fi

我非常喜欢 shell 脚本，但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.

顺便说一下，正如@Matthias 建议的那样，我已经交换了 empty.txt 和 full.txt 的角色.

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

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