Link files for Linux

Link files for Linux
========================================

The Linux link file is broken into hard link files and soft link files (symbolic link)

Note: There are two restrictions on hard links: (1) cannot cross the file system, (2) cannot link to a directory

ln
Command format:
ln [-S] [source file] [destination file]
The no-s option is a hard link
Plus-s option is to create a soft link

Example:
Hard Links
[Email protected] tmp]# mkdir Ln
[[Email protected] tmp]# CD LN
[Email protected] ln]# cp/etc/passwd.
[email protected] ln]# LL
Total Dosage 4
-rw-r--r--1 root root 1314 June 20:48 passwd
[Email protected] ln]# Du-sk
4.
[Email protected] ln]# LN passwd passwd-hard
[email protected] ln]# LL
Total Dosage 8
-rw-r--r--2 root root 1314 June 20:48 passwd
-rw-r--r--2 root root 1314 June 20:48 Passwd-hard
[[email protected] ln]# du-sk//du command used to calculate the size of a file or directory-K is expressed in kilobytes
4.
[[email protected] ln]# ll-i passwd passwd-hard//Hard link source file and destination file Inode consistent
50769012-rw-r--r--2 root root 1314 June 21:04 passwd
50769012-rw-r--r--2 root root 1314 June 21:04 Passwd-hard

[Email protected] ln]# rm-f passwd
[email protected] ln]# LL
Total Dosage 4
-rw-r--r--1 root root 1314 June 20:48 Passwd-hard
[Email protected] ln]# Du-sk
4.

[Email protected] ln]# mkdir 123
[[Email protected] ln]# LN 123 456//Hard link Cannot link directory
LN: "123": Do not allow hard links to be directed to the directory

Soft links
[Email protected] tmp]# mkdir Ln-soft
[Email protected] tmp]# CD ln-soft/
[Email protected] ln-soft]#!CP
CP/ETC/PASSWD./
[Email protected] ln-soft]# ln-s passwd passwd-soft
[email protected] ln-soft]# LL
Total Dosage 4
-rw-r--r--1 root root 1314 June 20:54 passwd
lrwxrwxrwx 1 root root 6 June 20:54 Passwd-soft-passwd
[[email protected] ln-soft]# ll-i passwd passwd-soft//Soft link source file and destination file Inode inconsistency.
17423155-rw-r--r--1 root root 1314 June 21:06 passwd
17423157lrwxrwxrwx 1 root root 6 June 25 21:06Passwd-soft-passwd
[Email protected] ln-soft]# head-n1 Passwd-soft
Root:x:0:0:root:/root:/bin/bash
[Email protected] ln-soft]# head-n1 passwd
Root:x:0:0:root:/root:/bin/bash
[Email protected] ln-soft]# rm-f passwd
[Email protected] ln-soft]# head-n1 Passwd-soft
Head: Unable to open "Passwd-soft" read data: No file or directory
[email protected] ln-soft]# LL
Total dosage 0
lrwxrwxrwx 1 root root 6 June 20:54 Passwd-soft-passwd

[Email protected] ln-soft]# CD.
[[email protected] tmp]# ln-s ln-soft ln-s-soft//Soft links can be linked to the directory
[Email protected] tmp]# ll-d ln-soft ln-s-soft
Drwxr-xr-x 2 root root 25 June 20:57 Ln-soft
lrwxrwxrwx 1 root root 7 June 21:01 Ln-s-soft-Ln-soft

Link files for Linux