Diff Command to Get Number of Different Lines Only

diff command to get number of different lines only

Yes you can, and in true Linux fashion you can use a number of commands piped together to perform the task.

First you need to use the diff command, to get the differences in the files.

diff file1 file2

This will give you an output of a list of changes. The ones your interested in are the lines prefixed with a '>' symbol

You use the grep tool to filter these out as follows

diff file1 file2 | grep "^>"

finally, once you have a list of the changes your interested in, you simply use the wc command in line mode to count the number of changes.

diff file1 file2 | grep "^>" | wc -l

and you have a perfect example of the philosophy that Linux is all about.

How to get the difference (only additions) between two files in linux

diff and then grep for the edit type you want.

diff -u A1 A2 | grep -E "^\+"

How to count differences between two files on linux?

diff -U 0 file1 file2 | grep -v ^@ | wc -l

That minus 2 for the two file names at the top of the diff listing. Unified format is probably a bit faster than side-by-side format.

How to display only different rows using diff (bash)

a.txt:

1;john;125;3
1;tom;56;2
2;jack;10;5

b.txt:

1;john;125;3
1;tom;58;2
2;jack;10;5

Use comm:

comm -13 a.txt b.txt 
1;tom;58;2

The command line options to comm are pretty straight-forward:

-1 suppress column 1 (lines unique to FILE1)

-2 suppress column 2 (lines unique to FILE2)

-3 suppress column 3 (lines that appear in both files)

How can I show lines in common (reverse diff)?

On *nix, you can use comm. The answer to the question is:

comm -1 -2 file1.sorted file2.sorted 
# where file1 and file2 are sorted and piped into *.sorted

Here's the full usage of comm:

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. 

Also note that it is important to sort the files before using comm, as mentioned in the man pages.

Get line numbers of differences in two files when performing a diff on two files in Windows

GNU DiffUtils is open source, free, and has a Windows port.

How to get only added/changed lines in diff?

Try

comm -1 -3 a.txt b.txt

comm, common lines, is a handy command.

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