Question: how to find the difference between two files in terminal?
Answer: diff Command. I like to start with the original Unix command-line tool that shows you the difference between two computer files. ... 
Vimdiff Command. ... 
Kompare. ... 
DiffMerge. ... 
Meld – Diff Tool. ... 
Diffuse – GUI Diff Tool. ... 
XXdiff – Diff and Merge Tool. ... 
KDiff3 – – Diff and Merge Tool.