Links
A link is a pointer to a file. Every time you create a file using vi or cp or by any other means, you are putting a pointer in a directory. This pointer associates a filename with a place on the disk. When you specify a filename in a command, you are indirectly pointing to the place on the disk where the information that you want is located.
Sharing files can be useful when two or more people are working on a project and need to share some information. You can make it easy for other users to access one of your files by creating additional links to the file.
To share a file with another user, first give the user permission to read from and write to the file. (In addition, you may have to change the access permission of the parent directory ...
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