ssh key and agent

Copied from https://help.github.com/en/articles/working-with-ssh-key-passphrases#auto-launching-ssh-agent-on-msysgit in case that page goes away.

Create a key pair.

ssh-keygen -t rsa -b 4096 -C "[email protected]"

Create or add to ~/.profile file

env=~/.ssh/agent.env

agent_load_env () { test -f "$env" && . "$env" >| /dev/null ; }

agent_start () {
    (umask 077; ssh-agent >| "$env")
    . "$env" >| /dev/null ; }

agent_load_env

# agent_run_state: 0=agent running w/ key; 1=agent w/o key; 2= agent not running
agent_run_state=$(ssh-add -l >| /dev/null 2>&1; echo $?)

if [ ! "$SSH_AUTH_SOCK" ] || [ $agent_run_state = 2 ]; then
    agent_start
    ssh-add
elif [ "$SSH_AUTH_SOCK" ] && [ $agent_run_state = 1 ]; then
    ssh-add
fi

unset env

Example agent.env file as referenced in .profile script.

SSH_AUTH_SOCK=/tmp/ssh-01fkZexxDP09/agent.3440; export SSH_AUTH_SOCK;
SSH_AGENT_PID=7496; export SSH_AGENT_PID;
echo Agent pid 7496;