How to compare two files

Look into the diff command. It's a good tool, and you can read all about it by typing man diff into your terminal.

The command you'll want to do is diff File_1.txt File_2.txt which will output the difference between the two and should look something like this:

A quick note on reading the output from the third command: The 'arrows' (< and >) refer to what the value of the line is in the left file (<) vs the right file (>), with the left file being the one you entered first on the command line, in this case File_1.txt

Additionally you might notice the 4th command is diff ... | tee Output_File this pipes the results from diff into a tee, which then puts that output into a file, so that you can save it for later if you don't want to view it all on the console right that second.

Or you can use Meld Diff

Meld helps you compare files, directories, and version controlled projects. It provides two- and three-way comparison of both files and directories, and has support for many popular version control systems.

Install by running:

sudo apt-get install meld

Your example:

Compare directory:

Example with full of text:

You can use vimdiff.

Example:

vimdiff  file1  file2