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select the identify(private key) for git

Option 1: ssh-agent

You can use ssh-agent to temporarily authorize your private key.

For example:

$ ssh-agent sh -c ‘ssh-add ~/.ssh/id_rsa; git fetch user@host’

Option 2: GIT_SSH_COMMAND

Pass the ssh arguments by using the GIT_SSH_COMMAND environment variable (Git 2.3.0+).

For example:

$ GIT_SSH_COMMAND=’ssh -i ~/.ssh/id_rsa -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no’
git clone user@host

You can type this all on one line — ignore $ and leave out the .
Option 3: GIT_SSH

Pass the ssh arguments by using the GIT_SSH environment variable to specify alternate ssh binary.

For example:

$ echo ‘ssh -i ~/.ssh/id_rsa -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no $*’ > ssh
$ chmod +x ssh
$ GIT_TRACE=1 GIT_SSH=’./ssh’ git clone user@host

Note: The above lines are shell (terminal) command lines which you should paste into your terminal. They will create a file named ssh, make it executable, and (indirectly) execute it.

Note: GIT_SSH is available since v0.99.4 (2005).
Option 4: ~/.ssh/config

Use the ~/.ssh/config file as suggested in other answers in order to specify the location of your private key, e.g.

Host github.com
User git
Hostname github.com
IdentityFile ~/.ssh/id_rsa

ssh-keygen -p -N “” -m pem -f /path/to/key

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