ln creates a link.
A filesystem distinguishes between file names (stored in the table of the directory that owns it) and the content of the file (inode).
A link defines a relationship between a filename and an inode.
ln command adds a link between a file inode and a new name.
ln source target
source is a file name, target is a file name that will have the same inode than target.
The number of links to a file can be obtained with the command
||remove existing destination file|
||creation of a symbolic link|
A symbolic link is a link to the name of the file and not to the inode.
touch a b ls -l ln a c ls -l ln -s b d ls -l ln a e ls -l