在 ~/.ssh/config 中添加配置

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Host github.com
    HostName github.com
    User git
    IdentityFile /Users/nbaoping/.ssh/id_rsa.github
    IdentitiesOnly yes

使用环境变量 GIT_SSH_COMMAND

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GIT_SSH_COMMAND="ssh -i ~/.ssh/id_rsa_example" git clone example

在仓库clone时指定key

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git clone git@github.com:yoyun/hello.git --config core.sshCommand="ssh -i ~/.ssh/you_ssh_key"

在config中指定key

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git config core.sshCommand "ssh -i ~/.ssh/you_ssh_key"