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Logs and Diagnostics

watch

Runs a command repeatedly and shows changing output.

watch is useful for observing system state such as disk usage, processes, or network sockets.

Syntax
watch [options] command

Arguments explained

  • -n sets interval seconds.
  • -d highlights differences.

Common examples

Watch disk space
watch -n 2 df -h

Refreshes disk usage every two seconds.

Highlight socket changes
watch -d 'ss -tln'

Shows listening TCP sockets and highlights changes.

watch Command
FieldDetails
Commandwatch
CategoryLogs and Diagnostics
Primary useRuns a command repeatedly and shows changing output.
Syntaxwatch [options] command

Related articles

top

Shows live process and resource usage.

df

Shows filesystem disk space usage.

ss

Inspects sockets and listening ports.