Environment Variables

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http://www.unix.com – 1. The problem statement: What is the mesg value set for your environment? If it is on, how would you turn off your current session? How would you set it permanently? 3. The attempts at a solution : Read Unix The textbook. 3rd chapter has many things like environment variables and ans setting value of a variable for our session or any subsequent session but nothing about "mesg" value. I think its a typo cuz google also doesn't show any result about it. also went through Operating System Concepts 8th edition 4. Punjab University College of Information technolog (HowTos)