Tạo symbolic link và hard link trong Linux

1. Create a symbolic link in UNIX


A symbolic link is a pointer to another file or directory. It can be used just like the original file or directory. A symbolic link appears in a long listing (ls -l) with a reference to the original file/directory. A symbolic link, as opposed to a hard link, is required when linking from one filesystem to another and can be used within a filesystem as well.


To create a symbolic link, the syntax of the command is similar to a copy or move command: existing file first, destination file second. For example, to link the directory /export/space/common/archive to /archive for easy access, use:

ln -s /export/space/common/archive /archive


To link the runtime control script /etc/init.d/httpd to /etc/rc2.d/S77httpd, use:

cd /etc/rc2.d
ln -s ../init.d/httpd S77httpd

Thi du 1:

De tao symbolic lien ket tu thu muc /vz4/private/200 den /vz/private/200

ta danh lenh sau nhu sau:

ln -s /vz4/private/200 /vz/private

chu y:

Chung ta khong can phai tao thu muc ten la: 200 trong thu muc /vz/private


Xoa Symbolic link:

de xoa lien ket symbolic link tren ta chi can go lenh sau:

unlink 200

2.Create a hard link in UNIX

A hard link is a reference to a file or directory that appears just like a file or directory, not a link. Hard links only work within a filesystem. In other words, don’t use hard links between mounted filesystems. A hard link is only a reference to the original file, not a copy of the file. If the original file is deleted, the information will be lost.


To create a hard link of the file /export/home/fred/stuff to /var/tmp/thing, use:

ln /export/home/fred/stuff /var/tmp/thing


The syntax for creating a hard link of a directory is the same.

To create a hard link of /var/www/html to /var/www/webroot, use:

ln /var/www/html /var/www/webroot


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