$SSH_AUTH_SOCK and $SSH_AGENT_PID

SSH_AUTH_SOCK=/tmp/ssh-WEk27297/agent.27297; export SSH_AUTH_SOCK;
SSH_AGENT_PID=27298; export SSH_AGENT_PID;                        
echo Agent pid 27298;                                             

This means that if you need to set the ssh-agent PID and SOCK environment settings by hand, you will need to know

1. the filename of the socket within the file system
2. the process ID of the ssh-agent process

#!/bin/bash
$pid=$1
$HashVal=$2
export "SSH_AUTH_SOCK=/tmp/ssh-$HashVal/agent.$pid"
export "SSH_AGENT_PID=$pid"
echo "SSH_AGENT_PID: $SSH_AGENT_PID"
echo "SSH_AUTH_SOCK: $SSH_AGENT_PID"

Note that the value passed in as the 2^nd parameter - the value assigned to $HashValue - is created by the ssh-agent on startup.