You’re running df -h every 30 seconds by hand to watch a disk fill up, typing the same command over and over like it’s your job, when there’s a single built-in tool that does it for you automatically.
Every sysadmin hits this situation at some point. You’re watching something (like disk usage or a process), and you keep running the same command again and again to see updates. Using tail isn’t helpful here, and you don’t feel like writing a loop or setting up a cron job.
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