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Chat with Users on the Same Machine via Terminal

Introduction

I've been looking several times for a way to chat with other people connected to the same machine as me. And since I'm tired of searching every time how to do it, I'm noting the solutions I found here.

Solutions

Chat with a single user

Use the write command:

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write user_you_want_to_talk_to

Then type your message and press Enter to validate.

Chat with all connected users

Use the wall command:

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echo "My message" | wall