/etc/hosts.equiv - list of hosts and users that are granted "trusted"
command access to your system
file allows or denies hosts and users to use the
-commands (e.g., rlogin
, or rcp
supplying a password.
The file uses the following format:
- [ + | - ] [hostname] [username]
is the name of a host which is logically equivalent to the
local host. Users logged into that host are allowed to access like-named user
accounts on the local host without supplying a password. The hostname
may be (optionally) preceded by a plus (+) sign. If the plus sign is used
alone, it allows any host to access your system. You can explicitly deny
access to a host by preceding the hostname
by a minus (-) sign. Users
from that host must always supply a password. For security reasons you should
always use the FQDN of the hostname and not the short hostname.
entry grants a specific user access to all user accounts
(except root) without supplying a password. That means the user is NOT
restricted to like-named accounts. The username
may be (optionally)
preceded by a plus (+) sign. You can also explicitly deny access to a specific
user by preceding the username
with a minus (-) sign. This says that
the user is not trusted no matter what other entries for that host exist.
Netgroups can be specified by preceding the netgroup by an @ sign.
Be extremely careful when using the plus (+) sign. A simple typographical error
could result in a standalone plus sign. A standalone plus sign is a wildcard
character that means "any host"!
Some systems will honor the contents of this file only when it has owner root
and no write permission for anybody else. Some exceptionally paranoid systems
even require that there be no other hard links to the file.
Modern systems use the Pluggable Authentication Modules library (PAM). With PAM
a standalone plus sign is considered a wildcard character which means
"any host" only when the word promiscuous
is added to the
auth component line in your PAM file for the particular service (e.g.,
This page is part of release 3.74 of the Linux man-pages
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