[ygra]

Lots of functions to start another process start a shell instead and is a command line to be executed, e.g. system or popen. The convenience in that case is that you don't need your own handling of $PATH or wildcards or argument parsing. It's pretty standard on UNIXoid systems.

[asveikau]

> The convenience in that case is that you don't need your own handling of $PATH

You don't with execvp or execlp either.

> or wildcards or argument parsing.

IMO this is of dubious value from, say, a C program. Why "parse" the args? Just generate a list...