AWK script to detect missing replies in Linux ping output, based on icmp_seq

detect_missing_icmq_seq.awk

#!/usr/bin/awk -f
#
# analyzes ping output on Linux and looks for missed returns
# based on icmp_seq
#
# ping output is expected on stdin
#

BEGIN { num = 0 }
$5 ~ /icmp_seq=/ {
	split($5, res, /=/);
	if (res[2] != num + 1) {
		print "missed between", num, "and", res[2] }
	num = res[2];
}

After adding the above content to a file, Do i need to capture the ping output to a file.