# linkchecker > Command line client to check HTML documents and websites for broken links. > More information: . - Find broken links on https://example.com/: `linkchecker {{https://example.com/}}` - Also check URLs that point to external domains: `linkchecker --check-extern {{https://example.com/}}` - Ignore URLs that match a specific regex: `linkchecker --ignore-url {{regex}} {{https://example.com/}}` - Output results to a CSV file: `linkchecker --file-output {{csv}}/{{path/to/file}} {{https://example.com/}}`