drop = 2
		}
		line = line[:len(line)-drop]
	}
	return
}

// collectFragments reads until the first occurrence of delim in the input. It
// returns (slice of full buffers, remaining bytes before delim, total number
// of bytes in the combined first two elements, error).
// The complete result is equal to
// `bytes.Join(append(fullBuffers, finalFragment), nil)`, which has a

	Waits for all background commands to complete.
	The output (and any error) from each command is printed to
	the log in the order in which the commands were started.
	After the call to 'wait', the script's stdout and stderr
	buffers contain the concatenation of the background
	commands' outputs.



The available conditions are:
[GOARCH:*]
	runtime.GOARCH == <suffix>
[GODEBUG:*]
	GODEBUG contains <suffix>
[GOEXPERIMENT:*]

			return nil, nil
		})
}

// Grep checks that file content matches a regexp.
// Like stdout/stderr and unlike Unix grep, it accepts Go regexp syntax.
//
// Grep does not modify the State's stdout or stderr buffers.
// (Its output goes to the script log, not stdout.)
func Grep() Cmd {
	return Command(
		CmdUsage{
			Summary: "find lines in a file that match a pattern",
			Args:    matchUsage + " file",

	//
	// If the command produces output or can be run in the background, run returns
	// a WaitFunc that will be called to obtain the result of the command and
	// update the engine's stdout and stderr buffers.
	//
	// Run itself and the returned WaitFunc may inspect and/or modify the State,
	// but the State's methods must not be called concurrently after Run has
	// returned.
	//