Short Arguments:
 -i	Replace stdin (default)
 -o	Replace stdout (default)
 -e	Replace stderr (default with feature REPLACE_STDERR)
 -I	No replace stdin
 -O	No replace stderr
 -E	No replace stderr (default without feature REPLACE_STDERR)

Examples:
	$ sink -ioe cat	# sink steam in,out,err
	$ sink -iOE cat	# sink stream in. keep stream out and err
	$ sink -O cat	# sink default streams, but keep out
	$ sink -E cat	# sink default streams and err
Redundant examples:
	$ sink -iI cat	# sink default streams and in (I comes after the redundant i)
	$ sink -Ii cat	# sink default streams except in (i comes after the redundant I)