Is there anything similar to the diff command in linux?

Could you please clarify the question?

IDEA can be used as a diff tool, allowing you to compare any 2 text files, or revisions of the file if VCS is enabled.

E.g. https://www.jetbrains.com/help/idea/2016.3/running-intellij-idea-as-a-diff-or-merge-command-line-tool.html

https://www.jetbrains.com/help/idea/2016.3/handling-differences.html

This is exactly what i'm looking for comparing between two text files