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time_start=`date +%s`

script body

time_end=`date +%s`
time_exec=`expr $(( $time_end - $time_start ))`

echo "Execution time is $time_exec seconds"

if you want get server name you can use
$ nslookup -t=ptr server_ip
but back resolve must be correct.

If PTR doesn't set -- you cann't get correct server name

there are several methods to...