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/usr/share/whereami/actions/settimezone is in whereami 0.3.34-0.4.

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#!/bin/sh
#
# Set timezone - contributed by Itay Ben-Yaacov
#

timezone=$1

if [ -f /usr/share/zoneinfo/$timezone ]; then 
  echo $timezone > /etc/timezone
  rm -f /etc/localtime && ln -sf /usr/share/zoneinfo/$timezone /etc/localtime
fi