SSH agent management for windows

ssh_agent.sh

function addkey() {
  # path to agent file with env vars
  env=~/.ssh/agent.env
  # path to RSA private key
  key=~/id_rsa
  
  agent_load_env () { test -f "$env" && . "$env" >| /dev/null ; }
  agent_start () { (umask 077; ssh-agent >| "$env") && . "$env" >| /dev/null ; }

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

  if [ -z "$SSH_AUTH_SOCK" ] || [ "$agent_run_state" = "2" ]; then
    agent_start
    ssh-add $key
    echo -e "Hi, put your name here :)"
  elif [ "$SSH_AUTH_SOCK" ] && [ "$agent_run_state" = "1" ]; then
    ssh-add $key
    echo -e "Running without key..."
  elif [ "$SSH_AUTH_SOCK" ] && [ "$agent_run_state" = "0" ]; then
    echo -e "SSH agent is already running."
  fi

  unset env
}

function offkey() {
  if [ "${SSH_AGENT_PID+1}" == "1" ]; then
    ssh-add -D
    ssh-agent -k > /dev/null 2>&1
    unset SSH_AGENT_PID
    unset SSH_AUTH_SOCK
  else
    echo "There is no ssh agent running."
  fi
}

function viewkey() {
  ssh-add -L 
}