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

LookPath searches for an executable binary 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 records the name of a binary that failed to be executed and the reason it failed.

An ExitError reports an unsuccessful exit by a command.