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+.\"-
+.\" SPDX-License-Identifier: BSD-3-Clause
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\" The Regents of the University of California. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\" may be used to endorse or promote products derived from this software
+.\" without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd April 29, 2024
+.Dt SERVICES 5
+.Os
+.Sh NAME
+.Nm services
+.Nd internet service name and port number data base
+.Sh DESCRIPTION
+The
+.Nm
+file contains information regarding
+the known services available in the
+Internet.
+For each service a single line should be present
+with the following information:
+.Bd -unfilled -offset indent
+official service name
+port number
+protocol name
+aliases
+.Ed
+.Pp
+Items are separated by any number of blanks and/or tab characters.
+The port number and protocol name are considered a single
+.Em item ;
+a ``/'' is used to
+separate the port and protocol (e.g.\& ``512/tcp'').
+A ``#'' indicates the beginning of
+a comment; subsequent characters up to the end of the line are
+not interpreted by the routines which search the file.
+.Pp
+Service names may contain any printable
+character other than a field delimiter, newline,
+or comment character.
+.Pp
+If
+.Dq db
+is specified as source in the
+.Xr nsswitch.conf 5 ,
+.Pa /var/db/services.db
+is searched.
+The database in
+.Pa /var/db/services.db
+needs to be updated with
+.Xr services_mkdb 8
+after changes to the services file have been applied.
+.Sh NIS INTERACTION
+Access to the NIS
+.Pa services.byname
+map can be enabled by adding a single ``+'' on a line by itself
+in the
+.Pa /etc/services
+file.
+This causes the contents of the NIS services map to be inserted
+at the location where the ``+'' appears.
+.Sh FILES
+.Bl -tag -width /etc/services -compact
+.It Pa /etc/services
+The
+.Nm
+file resides in
+.Pa /etc .
+.El
+.Sh SEE ALSO
+.Xr getservent 3 ,
+.Xr nsswitch.conf 5 ,
+.Xr services_mkdb 8
+.Sh HISTORY
+The
+.Nm
+file format appeared in
+.Bx 4.2 .
+.Sh BUGS
+A name server should be used instead of a static file.