Git的衍合原理是，在两个分支同时提交更新，在一个分支衍合另外一个分支，相当于那对方的补丁来更新自己，而被衍合的分支不发生改变。

[root@localhost wanyan]# vi rebase1

[root@localhost wanyan]# cat rebase1

first

[root@localhost wanyan]# vi rebase2

[root@localhost wanyan]# cat rebase2

1

[root@localhost wanyan]# git init

Initialized empty Git repository in /git/wanyan/.git/

[root@localhost wanyan]# git add .

[root@localhost wanyan]# git commit -m '1st commint'

[master (root-commit) 9e8b3cd] 1st commint

 2 files changed, 2 insertions(+), 0 deletions(-)

 create mode 100644 rebase1

 create mode 100644 rebase2

 [root@localhost wanyan]# git branch laji

[root@localhost wanyan]# git branch

  laji

* master

[root@localhost wanyan]# git checkout laji

Switched to branch 'laji'

[root@localhost wanyan]# vi rebase1

[root@localhost wanyan]# cat rebase1

first

two

[root@localhost wanyan]# git commit -a -m "laji"

[laji 065adde] laji

 1 files changed, 1 insertions(+), 0 deletions(-)

[root@localhost wanyan]# git checkout master

Switched to branch 'master'

[root@localhost wanyan]# vi rebase2

[root@localhost wanyan]# cat rebase2

1

2

[root@localhost wanyan]# git commit -a -m "master"

[master ce848ae] master

 1 files changed, 1 insertions(+), 0 deletions(-)

[root@localhost wanyan]# git branch

  laji

* master

[root@localhost wanyan]# git checkout laji

Switched to branch 'laji'

[root@localhost wanyan]# git branch

* laji

  master

[root@localhost wanyan]# git rebase master

First, rewinding head to replay your work on top of it...

Applying: laji

[root@localhost wanyan]# cat rebase1

first

two

[root@localhost wanyan]# cat rebase2

1

2

[root@localhost wanyan]# git branch master

fatal: A branch named 'master' already exists.

[root@localhost wanyan]# git checkout  master

Switched to branch 'master'

[root@localhost wanyan]# cat rebase2

1

2

[root@localhost wanyan]# cat rebase2

1

2

[root@localhost wanyan]# cat rebase1

first

这个是单独的实例仅仅为了理解原理，无实践意义。