1. ssh-agent and ssh-add
  2. Pageant

ssh-agent and ssh-add

If ssh-agent is running, this environment variable should be set:

echo $SSH_AUTH_SOCK

If not running, start ssh-agent like so

ssh-agent /bin/bash

List the identities that ssh-agent is aware of like this

ssh-add -L

Pageant

This is a tool for Windows that provides essentially the same functionality that ssh-agent provides.

Download From here: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html