[motadou@localhost ~]$ protoc -h
Usage: protoc [OPTION] PROTO_FILES
Parse PROTO_FILES and generate output based on the options given:
-IPATH, --proto_path=PATH 指定包含文件的搜索目录。
可以同时指定多个，程序按指定的顺序搜索特定的文件。
如果没有指定，其默认值为当前目录。
--version 打印版本号，并退出程序
-h, --help 打印帮助信息，并退出程序
--encode=MESSAGE_TYPE Read a text-format message of the given type
from standard input and write it in binary
to standard output. The message type must
be defined in PROTO_FILES or their imports.
--decode=MESSAGE_TYPE Read a binary message of the given type from
standard input and write it in text format
to standard output. The message type must
be defined in PROTO_FILES or their imports.
--decode_raw Read an arbitrary protocol message from
standard input and write the raw tag/value
pairs in text format to standard output. No
PROTO_FILES should be given when using this
flag.
-oFILE, Writes a FileDescriptorSet (a protocol buffer,
--descriptor_set_out=FILE defined in descriptor.proto) containing all of
the input files to FILE.
--include_imports When using --descriptor_set_out, also include
all dependencies of the input files in the
set, so that the set is self-contained.
--include_source_info When using --descriptor_set_out, do not strip
SourceCodeInfo from the FileDescriptorProto.
This results in vastly larger descriptors that
include information about the original
location of each decl in the source file as
well as surrounding comments.
--error_format=FORMAT Set the format in which to print errors.
FORMAT may be 'gcc' (the default) or 'msvs'
(Microsoft Visual Studio format).
--print_free_field_numbers Print the free field numbers of the messages
defined in the given proto files. Groups share
the same field number space with the parent
message. Extension ranges are counted as
occupied fields numbers.
--plugin=EXECUTABLE Specifies a plugin executable to use.
Normally, protoc searches the PATH for
plugins, but you may specify additional
executables not in the path using this flag.
Additionally, EXECUTABLE may be of the form
NAME=PATH, in which case the given plugin name
is mapped to the given executable even if
the executable's own name differs.
--cpp_out=OUT_DIR 生成C++语言的头文件以及代码文件，OUT_DIR为生成代码的存放路径
--java_out=OUT_DIR 生成Java语言的代码文件，OUT_DIR为生成代码的存放路径
--javanano_out=OUT_DIR 生成Java语言精简版的代码文件，OUT_DIR为生成代码的存放路径
--python_out=OUT_DIR 生成Python语言的代码文件，OUT_DIR为生成代码的存放路径
--ruby_out=OUT_DIR 生成Ruby语言的代码文件，，OUT_DIR为生成代码的存放路径
