Are you looking to replace the current version of the file (undoing changes to the file back to a past commit) or are you trying to make a new file containing t

Are you looking to replace the current version of the file (undoing changes to the file back to a past commit) or are you trying to make a new file containing the contents of the file at the time of the past commit? For the former, there's git checkout <branch> -- <filepath>, which has been given it's own command as git restore --source <branch> filename. For the latter, there's git show <ref>:<filepath>, which you then pipe into the file you want to write, like git show master:src/main.js > temp_main_old.js