hangc0276 opened a new pull request, #3227:
URL: https://github.com/apache/bookkeeper/pull/3227
### Motivation
When run `bin/bookkeeper shell ledgermetadata -h` command, it throw the
following exception.
```
23:02:41,236 ERROR Error parsing command line arguments :
org.apache.commons.cli.UnrecognizedOptionException: Unrecognized option: -h
at org.apache.commons.cli.Parser.processOption(Parser.java:363)
~[commons-cli-commons-cli-1.2.jar:1.2]
at org.apache.commons.cli.Parser.parse(Parser.java:199)
~[commons-cli-commons-cli-1.2.jar:1.2]
at org.apache.commons.cli.Parser.parse(Parser.java:85)
~[commons-cli-commons-cli-1.2.jar:1.2]
at
org.apache.bookkeeper.bookie.BookieShell$MyCommand.runCmd(BookieShell.java:240)
~[org.apache.bookkeeper-bookkeeper-server-4.16.0-SNAPSHOT.jar:4.16.0-SNAPSHOT]
at org.apache.bookkeeper.bookie.BookieShell.run(BookieShell.java:2372)
~[org.apache.bookkeeper-bookkeeper-server-4.16.0-SNAPSHOT.jar:4.16.0-SNAPSHOT]
at org.apache.bookkeeper.bookie.BookieShell.main(BookieShell.java:2463)
~[org.apache.bookkeeper-bookkeeper-server-4.16.0-SNAPSHOT.jar:4.16.0-SNAPSHOT]
ledgermetadata: Print the metadata for a ledger, or optionally dump to a
file.
usage: ledgermetadata -ledgerid <ledgerid> [--dump-to-file
FILENAME|--restore-from-file FILENAME]
-dumptofile <arg> Dump metadata for ledger, to a file
-l,--ledgerid <arg> Ledger ID
-restorefromfile <arg> Restore metadata for ledger, from a file
```
### Changes
Add `-h` and `--help` support.
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