{"record":{"id":"bac7af6a361df63e","repo":"apache/hadoop","slug":"cmd-unknown-command","errorCode":null,"errorMessage":"`\" + cmd + \"': Unknown command","messagePattern":"`\" \\+ cmd \\+ \"': Unknown command","errorType":"validation","errorClass":"UnknownCommandException","httpStatus":null,"severity":"error","filePath":"hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsShell.java","lineNumber":217,"sourceCode":"    printInfo(out, cmd, false);\n  }\n\n  // print all helps\n  private void printHelp(PrintStream out) {\n    printInfo(out, null, true);\n  }\n\n  // print one help\n  private void printHelp(PrintStream out, String cmd) {\n    printInfo(out, cmd, true);\n  }\n\n  private void printInfo(PrintStream out, String cmd, boolean showHelp) {\n    if (cmd != null) {\n      // display help or usage for one command\n      Command instance = commandFactory.getInstance(\"-\" + cmd);\n      if (instance == null) {\n        throw new UnknownCommandException(cmd);\n      }\n      if (showHelp) {\n        printInstanceHelp(out, instance);\n      } else {\n        printInstanceUsage(out, instance);\n      }\n    } else {\n      // display help or usage for all commands \n      out.println(getUsagePrefix());\n      \n      // display list of short usages\n      ArrayList<Command> instances = new ArrayList<Command>();\n      for (String name : commandFactory.getNames()) {\n        Command instance = commandFactory.getInstance(name);\n        if (!instance.isDeprecated()) {\n          out.println(\"\\t[\" + instance.getUsage() + \"]\");\n          instances.add(instance);\n        }","sourceCodeStart":199,"sourceCodeEnd":235,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsShell.java#L199-L235","documentation":"Error \"`\" + cmd + \"': Unknown command\" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsShell.java:217 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Run 'hadoop fs -help' to list supported commands and fix the command name.","Check for typos in the command passed to FsShell."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-22T20:17:22.307Z"}