How do I get the return value of the Shell function and the return value of the shell command?

1. Gets the return value of the Shell function call:

#!/bin/sh info ()  {     cat jlb.sh}  res= ' info ' echo ' state: ' $?echo ' res: ' ${res}

description : res='info' This behavior calls function info, inside the symbol ' is not a single argument, but the ESC key below the one. Another $? Returns the run state of the previous command, not the return value.

2, get the return value of the shell command, the same principle, such as:

#!/bin/sh info= ' cat jlb.sh ' echo ' info: ' ${info}

Note : same 1

How do I get the return value of the Shell function and the return value of the shell command?