This function returns the length of a string value. All printable characters within the string are counted. This includes white space characters, where tabs are counted as a single character, and symbols, such as $ or %. Non-printable characters are also counted, such as newline and carriage returns. Remember in Windows systems that the end of a line in a multi-line string value contains two command characters, \n and \r, which will be counted by the <<length...>> function as one character each.