It's a gitconfig file!

.gitconfig

[user]
  email = jeremiah.peschka@gmail.com
  name = Jeremiah Peschka
[github]
  user = peschkaj
[core]
  autocrlf = input
  safecrlf = true
  excludesfile = /Users/jeremiah/.gitignore
  editor = subl
[alias]
  aliases = config --get-regexp alias
  amend = commit --amend
  bl = blame -w -M -C
  br = branch
  bra = branch -rav
  branches = branch -rav
  changed = status -sb
  ci = commit
  co = checkout
  dump = cat-file -p
  f = !git ls-files | grep -i
  filelog = log -u
  hist = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue) [%an]%Creset' --abbrev-commit --date=relative
  last = log -p --max-count=1 --word-diff
  lastref = rev-parse --short HEAD
  lasttag = describe --tags --abbrev=0
  pick = add -p
  pr = pull --rebase
  remotes = remote -v show
  st = status
  stage = add
  standup = log --since yesterday --oneline --author {ME}
  stats = diff --stat
  sync = ! git fetch upstream -v && git fetch origin -v && git checkout master && git merge upstream/master
  type = cat-file -t
  undo = reset head~
  unstage = reset HEAD
  wdiff = diff --word-diff
  who = shortlog -s -e --
[color]
  ui = true
[push]
  default = simple