hbase-shell/src/main/ruby/shell/commands/revoke.rb

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module Shell
  module Commands
    class Revoke < Command
      def help
        return <<-EOF
Revoke a user's access rights.
Syntax : revoke <user> [, <@namespace> [, <table> [, <column family> [, <column qualifier>]]]]

Note: Groups and users access are revoked in the same way, but groups are prefixed with an '@' 
      character. In the same way, tables and namespaces are specified, but namespaces are 
      prefixed with an '@' character.

For example:

    hbase> revoke 'bobsmith'
    hbase> revoke '@admins'
    hbase> revoke 'bobsmith', '@ns1'
    hbase> revoke 'bobsmith', 't1', 'f1', 'col1'
    hbase> revoke 'bobsmith', 'ns1:t1', 'f1', 'col1'
EOF
      end

      def command(user, table_name=nil, family=nil, qualifier=nil)
        format_simple_command do
          security_admin.revoke(user, table_name, family, qualifier)
        end
      end
    end
  end
end