git blame <pathname>

identify changes in a file by author and time.

The git blame command displays a file's history, annotating each line with commit, author, and timestamp. This helps developers trace changes, identify contributors, and understand the context behind modifications. It facilitates collaboration, bug tracking, and exploring the evolution of a file, offering insights into team members' work and enhancing the understanding of code changes throughout the project's development process.

Specific examples:
git blame src/file1.txt