[CentOS 7 Series]linux System file types

The LS command is the most commonly used command under Linux. The LS command is the abbreviation for list. The LS command not only allows you to view the files contained in a Linux folder, but also to view file permissions (including directories, folders, file permissions) to view directory information, and so on.

1. Command format:

ls [options] [directory name]

2. Command function:

Lists all subdirectories and files in the destination directory.

3. Common parameters

Serial number	Command	Role	Note
1	Ls-l	Show more information	Ls-l = ll
2	Ls-d	Show directory information only
3	Ls-a	Show all file information	Hidden files are in the file name with "." The beginning of the file.
4	Ls-i	Displays the inode number of the file	The inode is a data structure in the UNIX operating system, which is essentially a struct, which contains some important information related to each file in the file system.
5	Ls-h	User-friendly display units
6	Ls-t	Sort by Time display
7	LS--color	Color-coded display
8	LS--help	Display Help information
9	LS--version	View version information for the LS command

4. Instructions for LL

When using the LS command, we find that the effect of the ls-l and LL commands is consistent. This is the alias effect for the system default settings.

We can also customize various aliases by using the alias command, which makes it easy for you to get used to.

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Let's look at the information shown in Ls-l:

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The first letter of the first column that is displayed represents the file type of the object. In Linux systems, file types are common: ordinary files, directories, character device files, block device files, symbolic link files, and so on.

The specific sorting is as follows:

Serial number	Identifier	File type	Note
1	-	Normal file or binary file	It is generally created with some related applications, like tools, documentation tools, archive tools .... or CP tools.
2	D	Directory
3	L	Link file	Create a linked file through Ln-s.
4	C	Character device files	such as the cat and other serial devices.
5	B	Block device files	such as hard drives, optical drives and other devices.
6	S	Socket file	for communication.

This article is from the "garbled Age" blog, please be sure to keep this source http://juispan.blog.51cto.com/943137/1931658

[CentOS 7 Series]linux System file types