telnet and ssh permit users to log in to the server and work together there on shared files. Using tools such as FTP and scp, files developed elsewhere can be placed on the server when users want to permit shared access to those files. As shown in Chapter 3, "Login Services," all that is required for this type of access is a user account for each user and the necessary daemons to provide the services. After a user successfully logs in to a Linux server, file sharing is controlled through the file permissions that exist in the Linux filesystem.
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