Andrew Wang created HADOOP-9267:
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Summary: hadoop -help, -h, --help should show usage instructions
Key: HADOOP-9267
URL: https://issues.apache.org/jira/browse/HADOOP-9267
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 3.0.0
Reporter: Andrew Wang
Assignee: Andrew Wang
Priority: Minor
It's not friendly for new users when the command line scripts don't show usage
instructions when passed the defacto Unix usage flags. Imagine this sequence of
commands:
{noformat}
-> % hadoop --help
Error: No command named `--help' was found. Perhaps you meant `hadoop -help'
-> % hadoop -help
Error: No command named `-help' was found. Perhaps you meant `hadoop help'
-> % hadoop help
Exception in thread "main" java.lang.NoClassDefFoundError: help
Caused by: java.lang.ClassNotFoundException: help
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: help. Program will exit.
{noformat}
Same applies for the `hdfs` script.
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