UNIX for Advanced & Expert Users

#!/bin/ksh
zees=$( tr -dc 'z' < inputfile)
echo ${#zees}

awk 'NF>1{
	printf "rec: %d ",FNR
	for (i=1;i<=NF-1; i++)
		printf ( index($0,$(i+1)) - 1 ) ? "pos: "index($0,$(i+1)) - 1" ": "pos: "length" "
	print ""
	tot += ( NF - 1 )
} 
NF > 2 {
	gsub(FS,"NEW")
	} 
{ 
	all[FNR] = $0
} END {
	printf "total [ %s ] in %s: %d\n", FS, FILENAME, tot
	if ( tot )
		{
			printf "New %s content:\n", FILENAME
			for (r=1; r<=FNR; r++)
			print all[r]
	}
}' FS="z" filename