How to Inform All logged in Users About A Maintenance Task Using The Wall Command in Linux

How to Inform All logged in Users About A Maintenance Task Using The Wall Command in Linux

wall (Unix) wall (an abbreviation of write to all) is a Unix command-line utility that displays the contents of a computer file or standard input to all logged-in users. It is typically used by root to send out shutting down message to all users just before power off.
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