LINELENGTH

The LINELENGTH command returns the length of its arguments, all concatenated and separated by one space character from one another.

var := LINELENGTH arg1 ... argn

// returns 5 (3 arguments of 1 character each, plus 2
// whitespace characters, one separating "a" from "b", the
// other separating "b" from "c"
#a := linelength a b c

// also returns 5 (3 arguments of 1 character each, plus 2
// whitespace characters, one separating "a" from "b", the
// other separating "b" from "c"
#a := linelength  a    b       c

// returns 5 - due to quoting, the first argument now is "a b c"
#a := linelength 'a b c'

// returns 6 - there is exactly one quoted argument, and under
// quotes, each whitespace character counts
#a := linelength 'a  b c'

Compare this with the LENGTH command returning the length of its first argument only:

// returns 5 (length of "hello")
#len := linelength hello world

// returns 11 (length of "hello", plus one delimiting character,
// plus length of "world")
#len := linelength hello world