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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | SEE ALSO | COLOPHON |
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getent(1) General Commands Manual getent(1)
getent - get entries from Name Service Switch libraries
getent [option ...] database key ...
The getent command displays entries from databases supported by
the Name Service Switch libraries, which are configured in
/etc/nsswitch.conf. If one or more key arguments are provided,
then only the entries that match the supplied keys will be
displayed. Otherwise, if no key is provided, all entries will be
displayed (unless the database does not support enumeration).
The database may be any of those supported by the GNU C Library,
listed below:
ahosts When no key is provided, use sethostent(3), gethostent(3),
and endhostent(3) to enumerate the hosts database. This is
identical to using hosts(5). When one or more key
arguments are provided, pass each key in succession to
getaddrinfo(3) with the address family AF_UNSPEC,
enumerating each socket address structure returned.
ahostsv4
Same as ahosts, but use the address family AF_INET.
ahostsv6
Same as ahosts, but use the address family AF_INET6. The
call to getaddrinfo(3) in this case includes the
AI_V4MAPPED flag.
aliases
When no key is provided, use setaliasent(3),
getaliasent(3), and endaliasent(3) to enumerate the aliases
database. When one or more key arguments are provided,
pass each key in succession to getaliasbyname(3) and
display the result.
ethers When one or more key arguments are provided, pass each key
in succession to ether_aton(3) and ether_hostton(3) until a
result is obtained, and display the result. Enumeration is
not supported on ethers, so a key must be provided.
group When no key is provided, use setgrent(3), getgrent(3), and
endgrent(3) to enumerate the group database. When one or
more key arguments are provided, pass each numeric key to
getgrgid(3) and each nonnumeric key to getgrnam(3) and
display the result.
gshadow
When no key is provided, use setsgent(3), getsgent(3), and
endsgent(3) to enumerate the gshadow database. When one or
more key arguments are provided, pass each key in
succession to getsgnam(3) and display the result.
hosts When no key is provided, use sethostent(3), gethostent(3),
and endhostent(3) to enumerate the hosts database. When
one or more key arguments are provided, pass each key to
gethostbyaddr(3) or gethostbyname2(3), depending on whether
a call to inet_pton(3) indicates that the key is an IPv6 or
IPv4 address or not, and display the result.
initgroups
When one or more key arguments are provided, pass each key
in succession to getgrouplist(3) and display the result.
Enumeration is not supported on initgroups, so a key must
be provided.
netgroup
When one key is provided, pass the key to setnetgrent(3)
and, using getnetgrent(3) display the resulting string
triple (hostname, username, domainname). Alternatively,
three keys may be provided, which are interpreted as the
hostname, username, and domainname to match to a netgroup
name via innetgr(3). Enumeration is not supported on
netgroup, so either one or three keys must be provided.
networks
When no key is provided, use setnetent(3), getnetent(3),
and endnetent(3) to enumerate the networks database. When
one or more key arguments are provided, pass each numeric
key to getnetbyaddr(3) and each nonnumeric key to
getnetbyname(3) and display the result.
passwd When no key is provided, use setpwent(3), getpwent(3), and
endpwent(3) to enumerate the passwd database. When one or
more key arguments are provided, pass each numeric key to
getpwuid(3) and each nonnumeric key to getpwnam(3) and
display the result.
protocols
When no key is provided, use setprotoent(3),
getprotoent(3), and endprotoent(3) to enumerate the
protocols database. When one or more key arguments are
provided, pass each numeric key to getprotobynumber(3) and
each nonnumeric key to getprotobyname(3) and display the
result.
rpc When no key is provided, use setrpcent(3), getrpcent(3),
and endrpcent(3) to enumerate the rpc database. When one
or more key arguments are provided, pass each numeric key
to getrpcbynumber(3) and each nonnumeric key to
getrpcbyname(3) and display the result.
services
When no key is provided, use setservent(3), getservent(3),
and endservent(3) to enumerate the services database. When
one or more key arguments are provided, pass each numeric
key to getservbynumber(3) and each nonnumeric key to
getservbyname(3) and display the result.
shadow When no key is provided, use setspent(3), getspent(3), and
endspent(3) to enumerate the shadow database. When one or
more key arguments are provided, pass each key in
succession to getspnam(3) and display the result.
--service service
-s service
Override all databases with the specified service. (Since
glibc 2.2.5.)
--service database:service
-s database:service
Override only specified databases with the specified
service. The option may be used multiple times, but only
the last service for each database will be used. (Since
glibc 2.4.)
--no-idn
-i Disables IDN encoding in lookups for ahosts/getaddrinfo(3)
(Since glibc-2.13.)
--help
-? Print a usage summary and exit.
--usage
Print a short usage summary and exit.
--version
-V Print the version number, license, and disclaimer of
warranty for getent.
One of the following exit values can be returned by getent:
0 Command completed successfully.
1 Missing arguments, or database unknown.
2 One or more supplied key could not be found in the
database.
3 Enumeration not supported on this database.
nsswitch.conf(5)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 getent(1)
Pages that refer to this page: groups(1), homectl(1), userdbctl(1), users(1), nsswitch.conf(5), passwd(5@@shadow-utils), nss-myhostname(8), nss-mymachines(8), nss-systemd(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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