centos install git - use yum install

1,  Add the EPEL repository, then install it using yum.

  wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm
 
2, Install DAG's GPG key and Verify the package you have downloaded
    rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
    rpm -K rpmforge-release-0.5.2-2.el5.rf.*.rpm

3, Install it
 rpm -i rpmforge-release-0.5.2-2.el5.rf.i386.rpm

4, install git using yum
  yum install git