Time synchonization

htpdate.sh

#!/bin/bash
# This is a simple shell script to synchonize a computer's time with a webserver
# as reference time source.
# Make sure command 'curl' is installed or use 'wget' instead
# Use any server URL such as www.yahoo.com, www.ebay.com, www.ibm.com,
# www.microsoft.com, etc.
URL="http://www.google.com"

CURL=$(which curl)

get_date_from_server()
{
        ${CURL} -I ${URL} 2>&1 /dev/null | grep -E '^[[:space:]]*[dD]ate:' | head -n1 | \
                sed -e 's/^[[:space:]]*[dD]ate:[[:space:]]*//' -e 's/,//' | \
                awk '{print $1, $3, $2, $5 , "GMT", $4}'
}

if [ "${CURL}" == "" ]; then
        echo "Install 'curl' or modify me to use wget"
        exit
fi

sudo date -s "$(get_date_from_server)"