zdump --version (return code: 0)
zdump (Ubuntu GLIBC 2.23-0ubuntu5) 2.23
zdump --help (return code: 0)
zdump: usage: zdump [--version] [--help] [-{vV}] [-{ct} [lo,]hi] zonename ...
Report bugs to <https://bugs.launchpad.net/ubuntu/+source/glibc/+bugs>.