The code below traverses all the directories recursively inside the passed in command line argument directory. While traversing recursively if it finds a regular file with executable permission it remove the permission for the owner.

RecursiveDirectoryTraversal.sh

#!/bin/bash

#Recursively traverse the directories

traverseDirectory(){
	for fileName in `ls $1/`
	do
		echo "$1/$fileName"

		if [ -x $1/$fileName ]; then
			chmod o-x "$1/$fileName"
		fi

		if [ -d $1/$fileName ]; then
			echo "$1/$fileName"
			traverseDirectory "$1/$fileName"
		fi
	done
}


traverseDirectory "$1"