Put this somewhere on your .bash_profile

function addSSHIdentities() {
 pushd ~/.ssh
 #add all your keys here
 ssh-add some_private_key
 ssh-add some_private_key_2
 ssh-add some_private_key_3
  ...
 ssh-add some_private_key_N
 popd
}

function startSSHAgent() {
 SSH_AGENT_PROCESSES=`ps aux | grep ssh-agent | grep -v grep | wc -l`

 if [ $SSH_AGENT_PROCESSES -gt 0 ]
 then
   echo "SSH Agent was running. Not adding identities"
 else
   echo "Starting ssh-agent..."
   ssh-agent
   echo "Adding SSH Identities"
   addSSHIdentities
 fi
}

startSSHAgent

Reading the registry key won’t cut it. This does.

; isDefaultBrowserChrome
!define isDefaultBrowserChrome "!insertmacro isDefaultBrowserChrome"

!macro isDefaultBrowserChrome Result

   FileOpen $0 "$PLUGINSDIR\browser_detect.htm" "w"
   FileClose $0
   System::Call "Shell32::FindExecutable(t '$PLUGINSDIR\browser_detect.htm', i 0, t .r1)"
   ${StrLoc} $0 $1 "chrome.exe" ">"
   ${If} $0 != ""
       StrCpy ${Result} "1"
   ${Else}
       StrCpy ${Result} "0"
   ${EndIf}

!macroend