Use of Linux file command

file [-bchiklLNnprsvz0] [--apple] [--mime-encoding] [--mime-type] [-e testname] [-F separator] [-f namefile] [-m magicfiles] file ...
file -C [-m magicfiles]
file [--help]

-b, --brief: Simple mode, does not display file names;
-C, --compile: Generate magic.mgc file. Use with option -m -c, --checking-printout: Print out the analysis results of the magic file -e, --exclude [testname]: Exclude checking of files of the specified type. The values ​​of testname are apptype, ascii, encoding, tokens, cdf, compress, elf, soft, tar
-F, --separator [separator]: Replace the default ":" separator after the output file name with the specified separator -f, --files-from [namefile]: Read the files to be tested from the file namefile, one per line -i, --mime: Output a string of mime type instead of a readable string, for example, output "text/plain; charset=us-ascii" instead of "ASCII text"
--mime-type, --mime-encoding: Like -i, but only print the specified elements;
-k, --keep-going: Do not stop at the first match, keep checking -l, --list: Print information about the strength of each magic pattern
-L, --dereference: Check the file type of the file corresponding to the soft link -m, --magic-file [magicfiles]: Specify the magic file. Magic files refer to files with special contents, such as C files, which will have the word #include; the first few bytes of tar files will have special rules. The magic file inspection rule is to determine the type of a file based on these special formats. These rules are stored in $HOME/.magic.mgc
-N, --no-pad: Don't pad filenames so that they align in the output
-n, --no-buffer: Force flushing of standard output stdout. This option is only effective when checking multiple files. You can also use this option when getting file types through a pipeline -p, --preserve-date: preserve the access time of the file to be detected, even if the file command does not change the access time of the file to be detected
-r, --raw: Do not convert non-printable characters to octal form \ooo. Normally, file will do the conversion. -s, --special-files: Normally, the file command only supports the detection of ordinary files, just like stat(2). Use this option to allow the file command to support special files, such as raw disk partitions, etc. -v, --version: Display version information -z, --uncompress: Try to interpret the contents of the compressed file -0, --print0: Output a null character '\0' after the file name
--help: Display help information

[root@TENCENT64 ~]# file Changelog 
Changelog: ASCII text

[root@TENCENT64 ~]# file -b Changelog 
ASCII text

[root@TENCENT64 ~]# file -i Changelog 
Changelog: text/plain; charset=us-ascii

[root@TENCENT64 ~]# ll Changelog*
-rw-r--r-- 1 root root 1598 Nov 6 22:39 Changelog
lrwxrwxrwx 1 root root 9 Nov 6 23:07 Changelog.ln -> Changelog

# Look at the soft link type [root@TENCENT64 ~]# file Changelog.ln
Changelog.ln: symbolic link to `Changelog'

# View the file type of the soft link corresponding file [root@TENCENT64 ~]# file -L Changelog.ln
Changelog.ln: ASCII text