Bash function to fix access to SSH agent when using TMUX and agent forwarding

fixssh_fn.sh

# via https://coderwall.com/p/_s_xda/fix-ssh-agent-in-reattached-tmux-session-shells
fixssh() {
  for key in SSH_AUTH_SOCK SSH_CONNECTION SSH_CLIENT; do
    if (tmux show-environment | grep "^${key}" > /dev/null); then
      value=`tmux show-environment | grep "^${key}" | sed -e "s/^[A-Z_]*=//"`
      export ${key}="${value}"
    fi
  done
}