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#!/bin/sh start() { [ -f /etc/hostname ] && HOSTNAME="$(cat /etc/hostname)" [ -z "${HOSTNAME}" ] && HOSTNAME="$(hostname)" [ -z "${HOSTNAME}" ] && HOSTNAME='localhost' printf 'Setting hostname to %s... ' "${HOSTNAME}" hostname "${HOSTNAME}" printf 'done.\n' } case "${1}" in start) start ;; stop) ;; *) printf 'Usage: %s {start|stop}\n' "${0}" >&2 exit 1 ;; esac