gistfile1.txt

$ git fetch
...

$ git pull
You asked me to pull without telling me which branch you
want to merge with, and 'branch.andrew-working.merge' in
your configuration file does not tell me, either. Please
specify which branch you want to use on the command line and
try again (e.g. 'git pull <repository> <refspec>').
See git-pull(1) for details.

If you often merge with the same branch, you may want to
use something like the following in your configuration file:

    [branch "andrew-working"]
    remote = <nickname>
    merge = <remote-ref>

    [remote "<nickname>"]
    url = <url>
    fetch = <refspec>

See git-config(1) for details.

$ git pull master
fatal: 'master' does not appear to be a git repository
fatal: The remote end hung up unexpectedly

$ git branch
* andrew-working
  master

$ git status
...

$ emacs .git/config 
...

$ git pull
Already up-to-date.

$ git checkout
M	parse.mk

$ git checkout master
M	parse.mk
Switched to branch 'master'
Your branch is behind 'origin/master' by 11 commits, and can be fast-forwarded.