Sets the hostname for Mac OS in all the various places and ways.

set_macos_hostname.sh

#!/bin/bash
#
# set_macos_hostname.sh
# Sets the hostname for Mac OS in all the various places and ways.
#
# Author: Zach Jetson
# 

usage() {
  printf "[!] Error: missing hostname in argument\n\n"
  printf "usage:    $0 HOSTNAME\n\n"
  echo "HOSTNAME  The hostname to set for your computer"
  exit 1

}

if [ -z "$1" ]; then
  usage
else
  HOSTNAME=$1
fi

if [ "$EUID" -ne 0 ]; then
    echo "Update check requires root privileges"
    exec sudo /bin/bash "$0" "$1"
    exit 1
fi

scutil --set HostName "$HOSTNAME" 2>/dev/null
scutil --set LocalHostName "$HOSTNAME" 2>/dev/null
scutil --set ComputerName "$HOSTNAME" 2>/dev/null
dscacheutil -flushcache

echo "New hostname set: $(hostname -f)"