directory(+Dir)

Execute in the given directory

output(-Out)

Unify Out with a list of codes representing stdout of the command. Otherwise the output is handed to print_message/2 with level informational.

error(-Error)

As output(Out), but messages are printed at level error.

env(+Environment)

Environment passed to the new process.

If Executable is path(Program) and we have an environment we make sure to use the PATH from this environment for searching Program.