look

Find lines starting with a prefix

low risk

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

Binary search in sorted files/dictionary.

Examples
look prefix wordlistPrefix match · explain & risk-check →
Related
grep
Open the full explainer →More in Text Processing

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