er
      \f	form feed
      \n	new line
      \r	carriage return
      \t	horizontal tab
      \v	vertical tab
      \\	backslash
      \0nnn	the character whose ASCII code is NNN (octal).  NNN can be
    		0 to 3 octal digits
      \xHH	the eight-bit character whose value is HH (hexadecimal).  HH
    		can be one or two hex digits
      \uHHHH	the Unicode character whose value is the hexadecimal value HHHH.
    		HHHH can be one to four hex digits.
      \UHHHHHHHH the Unicode character whose value is the hexadecimal value
    		HHHHHHHH. HHHHHHHH can be one to eight hex digits.
    
    Exit Status:
    Returns success unless a write error occurs.