linux +验证文件是文本还是二进制 [英] linux + verify if file is text or binary

问题描述

如何在不打开文件的情况下验证文件是二进制文件还是文本文件?

How can I verify if the file is binary or text without to open the file?

推荐答案

薛定ding的猫.

没有打开文件就无法确定文件内容的方法.文件系统不存储与内容有关的元数据.

There is no way to determine the contents of a file without opening it. The filesystem stores no metadata relating to the contents.

如果不是必须打开文件，那么有许多解决方案可供您选择.

If not opening the file is not a hard requirement, then there are a number of solutions available to you.

在许多评论和答案中都建议file(1)是确定内容的一种好方法.它的确是.但是，file(1) 打开文件，该文件在问题中被禁止.请参见以下示例中的倒数第二行:

It has been suggested in a number of comments and answers that file(1) is a good way of determining the contents. Indeed it is. However, file(1) opens the file, which was prohibited in the question. See the penultimate line in the following example:

> echo 'This is not a pipe' > file.jpg && strace file file.jpg 2>&1 | grep file.jpg
execve("/usr/bin/file", ["file", "file.jpg"], [/* 56 vars */]) = 0
lstat64("file.jpg", {st_mode=S_IFREG|0644, st_size=19, ...}) = 0
stat64("file.jpg", {st_mode=S_IFREG|0644, st_size=19, ...}) = 0
open("file.jpg", O_RDONLY|O_LARGEFILE)  = 3
write(1, "file.jpg: ASCII text\n", 21file.jpg: ASCII text

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