Comparing files of two folders in UNIX

Normally you can't find how many files are different in two folders.It is possible only less amount of  files inside of two folders.If number of file increase means we can't compare whether present in both folders.For that we use below the command .It shows how many files are present in folder1 not in folder2 same as vice-versa


 diff  -r  pathOfFolder1   pathOfFolder2

Example :
folder1 constains t1,t2 and
folder2 contains t1,t4  means that output will like this

Only in pathOfFolder1 : t2
Only in pathOfFolder2 : t4