Here is a brief summary of some of the topics covered in this chapter.
nil; if none return a value that is not
nil. In brief, return the first true value of the arguments; return a true value if one or any of the others are true.
nil; if none are
nil, return the value of the last argument. In brief, return a true value only if all the arguments are true; return a true value if one and each of the others is true.
(interactive "P")to a numeric value.
forward-linegoes forward as far as it can and then returns a count of the number of additional lines it was supposed to move but couldn't.
tif its argument is a buffer; otherwise return