+
−#!/bin/sh
+
−#
+
−# try several ways to guess the hostname
+
−
+
−(
+
−
+
−# this is what Debian uses
+
−cat /etc/mailname
+
−
+
−# this is often the short hostname
+
−cat /etc/hostname
+
−
+
−# this file was mentioned on the Internet
+
−cat /etc/HOSTNAME
+
−
+
−# probably a good value on GNU/Linux
+
−hostname -f
+
−
+
−# often the short hostname, but widely available
+
−hostname
+
−
+
−) 2>/dev/null | sort -u