Run git blame
on the file. It'll show you the commit ID, the date and time, and who committed it- for each line. Then just copy out the commit identifier and you can use it in git log <commit>
or git show <commit>
.
For example, I've got a file, called test.txt, with lines added on different commits:
$ cat test.txt
First line.
Second line.
Running the git blame
:
$ git blame test.txt
^410c3dd (Leigh 2013-11-09 12:00:00 1) First line.
2365eb7d (Leigh 2013-11-09 12:00:10 2) Second line.
The first bit is the commit ID, then name, then date, time, time zone, and finally the line number and line contents.