Computing Command-line interface languages However, as time goes on, such style is used less and less, and even institutions that traditionally were using that style are now abandoning it. Such style is sometimes used even nowadays examples are: output generated by some UNIX console programs, rendering of man pages within some environments, technical documentation written long ago or written in old-school manner. Unicode now provides separate characters for opening and closing quotes. The use of apostrophe for opening quotes, the need on some typewriters to overprint apostrophe and period to get an exclamation mark, and the lack of a mirrored double-quote character, tended to change the apostrophe to the modern "typewriter" design that is vertical, so this no longer works. None of these were considered typographically correct. This allowed them to be used as matching pairs of open and close quotes, and also as grave and acute accents, and allowed the apostrophe to be used as a prime. Some early typewriters and ASCII peripherals designed the backtick and apostrophe to be mirror images of each other. As surrogate of apostrophe or (opening) single quote Thus, ISO 646 was born and the ASCII standard updated to include the backtick and other symbols. With the latter, a mark is made when a dead key is typed but, unlike normal keys, the paper carriage does not move on and thus, the next letter to be typed is printed under the accent. Keys can be dedicated to pre-composed characters or alternatively a dead key mechanism can be provided. On typewriters designed for languages that routinely use diacritics (accent marks), there are two possible solutions. Spanish typewriter (QWERTY keyboard) with dead keys for acute, circumflex, diaeresis and grave accents. History Typewriters Typewriter with French (AZERTY) keyboard: à, è, é, ç ù have dedicated keys the circumflex and diaeresis accents have dead keys. Provision (if any) of the backtick on other keyboards varies by national keyboard layout and keyboard mapping. On older keyboards, the Escape key was at this location, and the backtick key was somewhere on the right side of the layout. The sign is located on the left-top of a US or UK layout keyboard, next to the 1 key. Consequently, this ASCII symbol was rarely (if ever) used in computer systems for its original aim and became repurposed for many unrelated uses in computer programming. On early computer systems, however, this physical dead key+overtype function was rarely supported, being functionally replaced by precomposed characters. The character was designed for typewriters to add a grave accent to a (lower-case ) base letter, by overtyping it atop that letter. It is also known as backquote, grave, or grave accent. The backtick ` is a typographical mark used mainly in computing. U+0300 ◌̀ COMBINING GRAVE ACCENT (diacritic)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |