Released git version 1.5.3.4
yinping@kooxoo235:~/git$ git-pull --ff
Usage: /usr/local/bin/git-fetch <fetch-options> <repository> <refspec>...
yinping@kooxoo235:~/git$ git-pull --no-ff
Usage: /usr/local/bin/git-fetch <fetch-options> <repository> <refspec>...
yinping@kooxoo235:~/git$ git-merge --ff origin/master
Usage: /usr/local/bin/git-merge [-n] [--summary] [--no-commit]
[--squash] [-s <strategy>] [-m=<merge-message>] <commit>+
yinping@kooxoo235:~/git$ git-merge --no-ff origin/master
Usage: /usr/local/bin/git-merge [-n] [--summary] [--no-commit]
[--squash] [-s <strategy>] [-m=<merge-message>] <commit>+