If you want to find out the java class corresponding to any command, just peek inside "src/bin/nutch" script and at the bottom you would find a switch case with a case corresponding to each command. For 2.x, here are the important classes:
"inject" -> org.apache.nutch.crawl.InjectorJob "generate" -> org.apache.nutch.crawl.GeneratorJob "fetch" -> org.apache.nutch.fetcher.FetcherJob "parse" -> org.apache.nutch.parse.ParserJob "updatedb" -> org.apache.nutch.crawl.DbUpdaterJob Create a separate launcher for each of these. Running these without any i/p parameters would show you the usage of these commands.
