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. 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.
- -s service,
--service service
- Override all databases with the specified service. (Since glibc
2.2.5.)
- -s database:service,
--service 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.)
- -i, --no-idn
- 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.
- -V, --version
- 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.