/usr/bin/git (I think was Xcode install) but it is 188.8.131.52 and I want to use the current version 1.7.7
Is there a way to uninstall that version and use the new one?
You can install
There's a little video tutorial here. http://vimeo.com/14649488
It's for an older version but it will get you started, let me know if you need more info.
(You can also use MacPorts, Fink or the Git OS X installer, to upgrade.)
If you want to use git itself to update git run the following commands :
This can be run from anywhere
This will install Git into your /usr/bin folder for global use.
None of the current answers will upgrade Xcode git. They will only install a newer version of git.
Xcode have has changed its mind several times about the best git location. Depending on how long ago you have been installing Xcode you will see git binaries at:
Even if you update the PATH, Xcode will stick to its version. The only way I know to force it to use the newer version is replacing those git binaries by a link to the new one you installed.
Repeat for the other path. Notice I use a symbolic link, not a hard one. Otherwise Xcode would replace your other installation during an upgrade
You can install the latest git using macports:
If you want a newer git than the one in Xcode then you need to install it, this install should be to another place as if you update
There are several ways to do this but as noted by @FranciscoGarcia they won't necessarily change the one used by Xcode just the command line version.
The easiest is to install the binaries from the git site.
If you want code then use a package manager e.g. Fink macports, Homebrew.
If you want the bleeding edge latest install from git's own repository.