trace commands execution.
Because Bear[https://github.com/rizsotto/Bear] can't trace fork
system call
and execution tree.
Usage:
cmdcat [-solih] <command>
-s suppress stdout output
-o, --output <file> specify output file, default stdout
-l, --library <file> path of libccat
-i, --inet using AF_INET instead of AF_UNIX
--stream using SOCK_STREAM instead of SOCK_DGRAM
-p, --plugin <plugin> transform output by plugin. default is raw which directly dumps a json.
lua plugin has higher priority than embeded c++ plugin
--list-plugin list available plugin
--lua-source <file> lua plugin source file, default $HOME/.cmdcat.lua
-h display help