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Today, I would like to share with you the relevant knowledge points about the use of file commands to analyze examples. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look.

The file command is used to detect the type of a given file. The inspection of files by file command can be divided into three processes: file system, magic number check and language check.

Example 1: default

After file, follow the file directly to get the following information

➜file book.pdfdelete.pdf: PDF document, version 1.3➜ file bookdelete: PDF document, version 1.3

You can see that it doesn't matter whether you add a suffix or not.

Example 2: do not display the name ➜file-b book.pdfPDF document, version 1.3

Plus-b parameter, is the meaning of brief, will only display the file identification results, not the file name, which is actually not very friendly for many files.

Example 3: output understandable information ➜file-I delete.pdfdelete.pdf: application/pdf; charset=binary

Adding the-I parameter is the meaning of the mime type, and I don't know what it means, but I can easily read the meaning of the file type I want to know. That's enough, isn't it? after all, we're here to use file commands.

Example 4: view the file information of the file name in the file ➜cat hello.txtsunset.jpg➜ file-f hello.txtsunset.jpg: JPEG image data, JFIF standard 1.01

This sounds so mouthful, actually very simple, actually not difficult, plus the-f parameter, is the meaning of the file-from type, in the end is how many meanings, that is, you want to view the file type information of the file name in a file, read the file from this file to the information, you can know as follows.

Example 5: good-looking chicken ribs ➜file-F "=" sunset.jpg sunset.jpg = JPEG image data, JFIF standard 1.01

To tell you the truth, I don't understand what this function does. By default, it feels good, but of course this should be customized, as shown below:

Example 6: view the file information of the soft link ➜file a.jpg a.jpg: symbolic link to `sunset.jpg'➜ file-L a.jpg a.jpg: JPEG image data, JFIF standard 1.01

By default, if there is no L parameter, you can only get the information that the file is a soft link. If you add this parameter, you can see the file information of the source file, which is still a great feature.

These are all the contents of the article "file Command use example Analysis". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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