The Problem During incident response, you have an attacker IP and need to reconstruct their complete session history -- every connection, authentication attempt, session open, command execution (if logged), and disconnect. These events are spread across thousands of lines in auth.log, interleaved with legitimate traffic. grep pulls the individual lines, but you lose the session structure. You need to see the progression: connection accepted, session opened, sudo attempted, session closed. sed's address ranges and hold space let you extract these multi-line blocks intact. Extracting Session Blocks An SSH session in auth.log follows a predictable pattern: it starts with a connection or authentication line and ends with a session closed or disconnect line.…