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I am trying to execute the message in a specific time interval for every user that logs in to their root

  • duplicate of "how do i really annoy all logged in users because my message is way more important than their work"? – cas Nov 6 '15 at 10:41
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There are a few ways to do this:

  • use wall to broadcast a message to logged-in users. This has the drawback that it is sent even if they are editing a file. You can schedule that using cron, e.g., this entry in root's crontab:

    * 0 * * * wall /etc/motd

  • if they happen to be using bash (and if you have control over their configuration), the bash prompt can execute shell functions via PROMPT_COMMAND.

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