title: Remove some content of a file from git history
body: <p>When the repository was set up, in the initial commit one of the added files contained sensitive data (a programmers personal info) that should not have been there. Is it possible to completely erase that from the git history? Not the whole file, only a few lines with the sensitive data.</p>
  
  <p>The repository is fairly new so there are no branches and that specific file was not modified since the initial commit. (PS: I'm fairly new to git, I don't yet understand complex commands)</p>