Command vs. Exec

Perl already supports both methods, such that if you pass one string to "exec" containing shell characters, it calls the shell, and if you pass multiple arguments, it directly invokes "exec".

This module mostly just lets Perl's "exec" do its job, but also checks for the existence of the executable first, to make errors easier to catch. This check is skipped if there is a single-string command line.

Unix lets you run a different executable than what is listed in the first argument. (this feature lets one Unix executable behave as multiple different programs depending on what name it sees in the first argument) You can use that feature by passing separate options of "exe" and "command" to this module's constructor instead of a simple argument list. But, you can't mix a "exe" option with a shell-interpreted command line string.

Errors during Exec