Question

What I want is:

given a start commit p,

do the following:

git show p

and if finished reading and then press ENTER,automatically show the previous commit.

Until I press ctrl-c to terminate .

Is there a tool to do this?

Answer 1

Not exactly what you want, but the following is quite straight forward since <commit>~n designates the nth ancestor from a commit:

$ git checkout p
read...
$ git checkout p~1
read...
$ git checkout p~2
etc.

A small scripting effort will lead to the behavior you describe, though.