Hello. Your CloudABI need to be complemented by something. We lack object-oriented shell for it.
What I mean under object-oriented shell? Now the shells work with 3 binary streams and allow only their redirection. It is not fine: what if I need to pass a resource from one process to another? What if I need to pass multiple resources, for example multiple streams? In the case of multiple streams fifo can help, but in case of resources of other types it won't.

The proposial is to use programms as functions with variable number of arguments.
1 Each programm binary has a metadata block in it describing its command line format.
2 The shell reads that metadata block and validates vommand line before executing
3 when executing the shell passes arguments to a programm
4 The arguments are not text strings, they are objects of standardized types. For first time I propose to have the following types : string, number, input stream, output stream, input-output stream, network, error and void.
5 A programm has one return type, it can return either its return type or error.
6 A programm can either return its type and stop or return its type and daemonize itself. In the case it daemonizes itself it can be used by another program through the returned object.
7 Arguments types can be implicitly converted, for example strings can be converted into file descriptors which are iostreams.