execute library for go

CloseExtraFds closes any open file descriptors other than stdout, stdin, and stderr.

Exec looks up the binary in the path, closes file descriptors, and execs the binary.

IsTerminal returns true if the given file descriptor is a terminal.

WaitExit will steal the first SIGINT, SIGTERM or SIGHUP in non-quiet mode and pass them through to the executed process.

Colorizer is an io.Writer that colorizes console output.

SignalExit means the command exited via signal.

StatusExit means the command exited with a non-zero exit code.