What does in mean in linux

in means "create link" in Linux. The in command is used to establish a synchronized link for the specified file in another location. The syntax is "ln parameter source file target file"; it is created by default. Hard link, when the parameter is set to "-s", a soft link is created to the source file.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What does in mean in linux?

ln is another very important command in linux. Its function is to search for a certain file. Establish a synchronized link in another location. When we need to use the same file in different directories, we do not need to put a file that must be the same in every required directory. We only need to put it in a fixed directory, put the file, and then use the ln command to link it in other directories without repeatedly occupying disk space.

1. Command format:

ln [parameter][source file or directory][destination file or directory]

2. Command function:

In the Linux file system, there is a so-called link, which we can regard as an alias of a file, and links can be divided into two types: hard link and soft link (symbolic link), a hard link means that a file can have multiple names, while a soft link generates a special file whose content points to the location of another file. Hard links exist in the same file system, but soft links can span different file systems.

Soft link:

1. Soft link exists in the form of a path. Similar to shortcuts in the Windows operating system

2. Soft links can cross file systems, but hard links cannot

3. Soft links can link to a non-existent file name

4. Soft links can link directories

Hard links:

1. Hard links exist in the form of file copies. But it doesn't take up actual space.

2. It is not allowed to create hard links to directories

3. Hard links can only be created in the same file system

There are two points to note here:

First, the ln command will maintain the synchronization of each linked file, that is to say, no matter where you change, other files will have the same changes;

Second, ln The links are divided into soft links and hard links. The soft link is ln -s source file target file. It will only generate an image of the file at the location you selected and will not occupy disk space. The hard link ln source file Target file, without parameter -s, it will generate a file with the same size as the source file at the location you selected. Whether it is a soft link or a hard link, the file will keep changing synchronously.

The ln command is used to link files or directories. If two or more files or directories are specified at the same time, and the final destination is an existing directory, all previously specified files or directories will be copied to in this directory. If multiple files or directories are specified at the same time, and the final destination is not an existing directory, an error message will appear.

3． Command parameters:

Required parameters:

-b Delete, overwrite previously established links

-d Allow super users to create hard links to directories

- f Force execution of

-i interactive mode, prompt the user whether to overwrite the file if it exists

-n Treat symbolic links as general directories

-s soft links (symbolic links)

-v Display detailed processing

Select parameters:

-S “-S” or “--suffix=< Suffix backup string>”

-V “-V” or “--version-control=”

--help display Help information

--version Display version information

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