// In header: <boost/process/system.hpp> template<typename ... Args> int system(Args &&... args);
Launches a process and waits for its exit. It works as std::system, though it allows all the properties boost.process provides. It will execute the process and wait for it's exit; then return the exit_code.
int ret = system("ls");
Using this function with synchronous pipes leads to many potential deadlocks.
When using this function with an asynchronous properties and NOT passing an io_context object, the system function will create one and run it. When the io_context is passed to the function, the system function will check if it is active, and call the io_context::run function if not.