Command returns the Cmd struct to execute the named program with the given arguments.

CommandContext is like Command but includes a context.

LookPath searches for an executable named file in the directories named by the PATH environment variable.

ErrNotFound is the error resulting if a path search failed to find an executable file.

Cmd represents an external command being prepared or run.

Error is returned by LookPath when it fails to classify a file as an executable.

An ExitError reports an unsuccessful exit by a command.