change time

change-time.sh

#!/bin/bash
set -e
set -x

LOCALTZMD5=$(md5sum /etc/localtime|sed 's/ .*//')
TIMEZONE="Europe/London Europe/Paris America/Chicago America/Los_Angeles"
for tz in ${TIMEZONE};do
    [[ -e /usr/share/zoneinfo/${tz} ]] || exit 1
    md5=$(md5sum /usr/share/zoneinfo/${tz}|sed 's/ .*//')
    [[ ${LOCALTZMD5} == ${md5} ]] && { echo "Current: ${tz}, $(date)" ; break ;}
done


select tz in ${TIMEZONE};do
    [[ -e /usr/share/zoneinfo/${tz} ]] || exit 1
    sudo cp /usr/share/zoneinfo/${tz} /etc/localtime
    echo ${tz}|sudo tee /etc/timezone >/dev/null
    break
done
date