JAEN

macOS

log

SafeQuery unified logs

log show --last 1h --predicate '...'

Queries the unified log; --predicate filters by process/subsystem; stream follows live.

Examples

  • log show --last 30m --predicate 'process == "WindowServer"'Logs for one process

Syntax

log show [--last 1h] [--predicate 'expr'] / log stream

Before you run it

Read only.

Used when you see

Mac running slow
1
Scan unified logs for repeated errors
See the whole flow →
Mac won't sleep (or wakes up)
3
Find wake reasons in the logs
See the whole flow →
Time Machine backup fails
3
Look for backupd errors in unified logsFilter on process == "backupd".
See the whole flow →

Related commands

The same reference, with no signal at all

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