time

Time a command

low risk

interactive breakdown — edit the command and press Explain
$ 
What it does

Reports real, user and sys time. /usr/bin/time -v adds memory use.

Examples
time tar -czf a.tgz dirTime an archive · explain & risk-check →
/usr/bin/time -v ./jobPeak memory and I/O · explain & risk-check →
Related
timeout perf
Open the full explainer →More in Shell & Scripting

Reference text is hand-written and may be incomplete — check man time for your version. Test destructive commands on a non-production system first.