4.2BSD/usr/man/man1/hostid.1

Compare this file to the similar file:
Show the results in this format: 

.TH HOSTID 1 "1 April 1983"
.UC 4
.SH NAME
hostid \- set or print identifier of current host system
.SH SYNOPSIS
.B hostid
[ identifier ]
.SH DESCRIPTION
The
.I hostid
command prints the identifier of the current host in hexadecimal.
This numeric value is expected to be unique across all hosts and
is normally set to the host's Internet address.
The super-user can set the hostid by giving a hexadecimal
argument; this is usually done in the startup script /etc/rc.local.
.SH SEE ALSO
gethostid(2), sethostid(2)