watch
watch is a Linux command in the Process Management category, rated intermediate difficulty. Executes a command repeatedly and displays its output. Great for monitoring. The syntax is watch [options] command. Key options and parameters: command — command to run repeatedly. It returns repeated command output. A practical example: watch -n 2 df -h # Run every 2 seconds watch -d free -m # Highlight changes watch -g ls /tmp # Exit when output changes A close relative is ps, which reports a snapshot of current processes. A close relative is top, which real-time interactive process viewer. Updates every few seconds. A close relative is kill, which sends a signal to a process. Default signal is SIGTERM (terminate). More about this category: Linux process management commands — ps, top, kill, killall, pgrep, and more. Manage running processes and system resources. Related Process Management commands: ps, top, kill, killall, pgrep, pkill, nice, renice.