Checkout out the main branch:

CVS

export CVSROOT=/space/repo/1/dev
cvs checkout dev

git

git clone /space/freesurfer/repo/freesurfer

Checkout the stable branch:

# CVS
export CVSROOT=/space/repo/1/dev
cvs checkout -r stable6 dev

# git
git clone -b stable6 /space/freesurfer/repo/freesurfer

Replace a data file: