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cis/script/check/host/all/system_timezone_is_berlin.check.sh

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#!/bin/bash
_CURRENT_FILE='/etc/timezone'
#The file must be readable, then
#the number of lines containing "Europe/Berlin" must be one.
[ -r "${_CURRENT_FILE}" ] \
&& [ "1" == "$(cat "${_CURRENT_FILE}" | grep 'Europe/Berlin' | grep -c .)" ] \
&& exit 0
exit 1