elapsed_time ()
{
SEC=$1
(( SEC < 60 )) && echo "[Elapsed time: $SEC seconds]\c"

(( SEC >= 60 && SEC < 3600 )) && echo "[Elapsed time: $(( SEC / 60 )) \
min $(( SEC % 60 )) sec]\c"

(( SEC > 3600 )) && echo "[Elapsed time: $(( SEC / 3600 )) hr \
$(( (SEC % 3600) / 60 )) min $(( (SEC % 3600) % 60 )) sec]\c"
}