How to ignore blank lines?

To ignore blank lines when using the diff command, you can use the -I option, which allows you to specify a regular expression to ignore certain lines. For blank lines, you can use the following command:

diff -I '^\s*$' file1.txt file2.txt

Explanation:

• -I '^\s*$': This option tells diff to ignore lines that match the regular expression ^\s*$, which represents lines that are empty or contain only whitespace.

This way, diff will compare the files while ignoring any blank lines.