In this series of mini posts I will teach you a Linux lesson every day, it can be command , tricks , how to etc. The post will cover for beginner to advanced level. Welcome to Linux terminal.
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write
write is a Linux command used to send message to logged in user. You can install the command using sudo apt install write in Ubuntu
$ write admin please-restart-the-docker-container
* Her admin is the user
Following Linux manuals may help you