Open the config file in the .git directory, in the project base directory and create an alias section and append aliases to it, one per line.
vi .git/config
[core]
repositoryformatversion = 0
filemode = true
bare = false
logallrefupdates = true
[alias]
ci = commit
st = status
co = checkout
b = branch
l = log
d = diff
cmesg = log --pretty=format:"%s"
repositoryformatversion = 0
filemode = true
bare = false
logallrefupdates = true
[alias]
ci = commit
st = status
co = checkout
b = branch
l = log
d = diff
cmesg = log --pretty=format:"%s"
More information at: http://git.or.cz/gitwiki/Aliases
