需求
假设我有两个仓库：
git@github.com:everlose/CSS3Practice.git
git@gitlab.com:everlose/CSS3Practice.git
我希望能再一份本地的工程里push代码能同步到两个仓库里。
如果说push代码的指令如这般：git push all -all
命令行操作
输入：git remote add all git@gitlab.com:everlose/CSS3Practice.git
输入：git remote set-url --add all git@github.com:everlose/CSS3Practice.git
提交的时候只要输入：git push all -all。就可以生效。结果如下：
[core]
Saving password to keychain failed
Identity added: /Users/everlose/.ssh/id_rsa (/Users/everlose/.ssh/id_rsa)
Counting objects: 3, done.
Delta compression using up to 4 threads.
[core]
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 306 bytes | 0 bytes/s, done.
Total 3 (delta 2), reused 0 (delta 0)
To git@gitlab.com:everlose/FEDPractice.git
643bfce..e0fd8f3 master -> master
Branch master set up to track remote branch master from all.
[core]
Warning: Permanently added the RSA host key for IP address '192.30.252.120' to the list of known hosts.
Counting objects: 3, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 306 bytes | 0 bytes/s, done.
Total 3 (delta 2), reused 0 (delta 0)
To git@github.com:everlose/FEDPractice.git
643bfce..e0fd8f3 master -> master
Branch master set up to track remote branch master from all.
它的原理同下，都是修改了.git/config下的配置。
直接配置.git/config文件
进入项目的根目录，输入：vim .git/config。
添加如下一行的远程仓库配置，有多少个远程库,就配置多少个url即可。
[remote "all"]
url = git@gitlab.com:everlose/CSS3Practice.git
url = git@github.com:everlose/CSS3Practice.git
提交的时候只要输入：git push all -all。就可以生效。