How to create log in putty session?

Putty: Simple trick to log all session output by default

PuTTY

Log Into Linux Using Putty, WS_FTP or Oracle SQL

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How to create a log file of your PuTTY session? - ServerCake

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Save PuTTY output to file from command-line - Stack Overflow

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Secure Linux/UNIX access with PuTTY and OpenSSH