Linux file command

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The Linux file command is used to identify file types.

Through the file command, we can identify the type of the file.

Syntax

file [-bcLvz][-f <Name File>][-m <Magic Number File>...][File or Directory...]

Parameters:

• -b 　When listing identification results, do not display file names.
• -c 　Detailedly display the execution process of the command, convenient for debugging or analyzing the execution situation of the program.
• -f<Name File> 　Specify the name file, its content contains one or more file names, so that file can sequentially identify these files, with the format of one file name per column.
• -L 　Directly display the category of the file pointed to by the symbolic link.
• -m<magic number file> 　Specify a magic number file.
• -v 　Display version information.
• -z 　Attempt to interpret the content of compressed files.
• [File or Directory...] To determine the type of a file list, separate multiple files with spaces, and you can use shell wildcard characters to match multiple files.

Online Examples

Display File Type:

[root@localhost ~]# file install.log
install.log: UTF-8 Unicode text
[root@localhost ~]# file -b install.log      <== Do not display file name
UTF-8 Unicode text
[root@localhost ~]# file -i install.log      <== Display MIME category.
install.log: text/plain; charset=utf-8
[root@localhost ~]# file -b -i install.log
text/plain; charset=utf-8

Display Symbolic Link File Type

[root@localhost ~]# ls -l /var/mail
lrwxrwxrwx 1 root root 10 08-13 00:11 /var/mail -> spool/mail
[root@localhost ~]# file /var/mail
/var/mail: symbolic link to `spool/mail'
[root@localhost ~]# file -L /var/mail
/var/mail: directory
[root@localhost ~]# file /var/spool/mail
/var/spool/mail: directory
[root@localhost ~]# file -L /var/spool/mail
/var/spool/mail: directory

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