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linux soft connection usage

Popularity：426 ℃/2024-12-09 16:20:26

Reprinted with attribution:

　　In Linux, a Symbolic Link is a special type of file link, similar to a shortcut in Windows. It allows a user to access another file or directory via a file path without having to have an actual copy of the original file or directory. Soft links refer to files or directories by their filenames, rather than by their physical locations.

I. Relevant grammar

The basic syntax of the soft-connect command is as follows:

ln -s [source file or directory] [softlink filename]

Among them.-soption indicates the creation of a soft connection. If you do not add the-soption, a hard link is created.

Second, create a soft connection:

  • Example command:ln -s /usr/local/bin/python3 /usr/bin/python
  • Description: This command creates a file namedpythonThe softlink file that points to the/usr/local/bin/python3This source file. When you create a soft connection, a soft connection name is created in the specified directory.

  root@controller1:/usr/bin# ln -s /usr/local/bin/python2.7 /usr/bin/python4
  root@controller1:/usr/bin#

##Execute again with an exception
root@controller1:/usr/bin# ln -s /usr/bin/python2.7 /usr/bin/python4
ln: failed to create symbolic link '/usr/bin/python4': File exists
root@controller1:/usr/bin#
root@controller1:/usr/bin# ln -s /usr/bin/python2.7 /usr/bin/python5
root@controller1:/usr/bin#

The correct soft connection creation is shown in green, the wrong one is shown in red.

Third, check the soft connections:

  • ls -l /usr/bin/python
  • Description：This command will display the soft connection filepythondetails, which contains the path to the source file for the softlink (/usr/local/bin/python3) with an arrow symbol (->) is separate from the name of the flexible connection.
root@controller1:/usr/bin# ls -l /usr/bin/python5
lrwxrwxrwx 1 root root 18 Dec  1 12:39 /usr/bin/python5 -> /usr/bin/python2.7
root@controller1:/usr/bin#
  • l Indicates that this is a Symbolic Link.
  • rwxrwxrwx are the permissions of the softconnect (although these usually do not affect the behavior of the softconnect itself, but rather access to the target pointed to by the softconnect).
  • 1 is the number of links (for soft links, this value is usually not important).
  • user is the owner of the flexible connection.
  • user is the user group to which the soft connection belongs.
  • 9 is the size (in bytes) of the softwire file itself, which is usually a very small value because the softwire just contains a path to the target.
  • date cap (a poem)time is the last modification date and time of the soft connection.
  • linkname is the name of the flexible connection.
  • -> targetpath is the path to the destination file or directory to which the soft connection points.

IV. Delete soft links:

  • rm /usr/bin/python
  • Description：This command will delete the soft link filepythonbut does not affect the source file/usr/local/bin/python3The presence of the

 

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