pntpm4.ulb.ac.be/pntpm/Files/bash.pdf
http://mealldubh.com/bash-quick-reference-card/
IFS
IFS dictates the separator
IFS=$'\n' causes separate by line, not white space
\r = r (preserver literal value of next char)
' = preserves the literal value of each character within the quotes
" = preserves the literal value, except $, `, \, !. $ and ` retain special meaning. \ retains its special meaning only when followed by $, `, ", \, or <newline>. \" means a ".
$'string' = enable backslash-escape sequence, such as \r \n, see bash manual line 425.