To make use of a networked environment, it made sense to extend certain tools, some of which have already been described. Networks also created a need for new utilities to control and monitor them; this led to ideas for new tools that took advantage of network speed and connectivity. This section describes concepts and utilities for systems attached to a network; without a network connection, they are of little use.
Some commands, including rcp and rsh, work only if the remote system trusts your local computer (that is, the remote system knows your local computer and believes that it is not pretending to be a system that it is not). The /etc/hosts.equiv file lists trusted systems. For reasons of security, Superuser ...