Whta does '\+::::::/bin/bash' in /etc/passwd mean?
The answer lies in the nsswitch.conf(5)
man page:
Interaction with +/- syntax (compat mode)
Linux libc5 without NYS does not have the name service switch but does allow the user some policy control. In
/etc/passwd
you could have entries of the form+user
or+@netgroup
(include the specified user from the NIS passwd map),-user
or-@netgroup
(exclude the specified user), and+
(include every user, except the excluded ones, from the NIS passwd map).You can override certain passwd fields for a particular user from the NIS passwd map by using the extended form of
+user::::::
in /etc/passwd. Non-empty fields override information in the NIS passwd map.Since most people only put a
+
at the end of /etc/passwd to include everything from NIS, the switch provides a faster alternative for this case (passwd: files nis
) which doesn’t require the single+
entry in/etc/passwd
,/etc/group
, and/etc/shadow
. If this is not sufficient, the NSScompat
service provides full +/- semantics. By default, the source isnis
, but this may be overridden by specifyingnisplus
as source for the pseudo-databasespasswd_compat
,group_compat
andshadow_compat
. These pseudo-databases are only available in GNU C Library.
Assuming that your /etc/nsswitch.conf
contains passwd: compat
, I believe that that line means "include all NIS users, but override the login shell to /bin/bash
".
Related videos on Youtube
Funkwecker
Updated on September 18, 2022Comments
-
Funkwecker almost 2 years
Found the line
\+::::::/bin/bash
in my /etc/passwd, which looks strange to me. What does that mean? Has my computer been hacked?