In general, a line ends when FMSLogo encounters a newline character, a carriage return character followed by a newline character, or the end of the stream.

A line (an instruction line or one read by READLIST or READWORD) can be continued onto the following line if the character immediately before the line break is a tilde (~). READWORD preserves the tilde and the newline; READLIST does not. A tilde which appears anywhere else in a line has no special meaning.

A semicolon begins a comment in an instruction line. Logo ignores characters from the semicolon to the end of the line. A tilde (~) as the last character in the line still indicates a continuation line, but not a continuation of the comment.

Example:

PRINT "abc;comment ~
def
abcdef

There are some special delimiters which continue a line until a matching character is found without the need for a line continuation tilde.