Common Lines in a file, reverse diff

I had two big directories and I wanted to know the common files in each directory, it was like a reverse diff.

On Linux you can use the command comm, the basic details of the command below.

 comm [-1] [-2] [-3 ] file1 file2
-1 Suppress the output column of lines unique to file1.
-2 Suppress the output column of lines unique to file2.
-3 Suppress the output column of lines duplicated in file1 and file2. 

From looking at the command above you can easily see the differences in just one of the files/directories.

You can read the main man page for teh command but basically these are the main options to use.  If you are new to Linux then I would recommend knowing this one in your toolkit along with diff.

I am always interested in your thoughts so if you have any comments or feedback then please feel free to add any comments, or you can mail me  here.

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