Chorded keyboard (a writing system for the blind) uses either 6 or 8 tactile 'points' from which all letters and numbers are formed. When Louis Braille invented it, it was produced with a needle holing successively all needed points in a cardboard sheet. In 1892, Frank Haven Hall, superintendent of the Illinois Institute for the Education of the Blind, created the Hall Braille Writer, which was like a typewriter with 6 keys, one for each dot in a braille cell. The Perkins Brailler, first manufactured in 1951, uses a 6-key chord keyboard (plus a spacebar) to produce braille output, and has been
Dot (command) into smaller pieces, potentially enabling modular design. Sourcing is also often done by the shell on session startup for user profile files like codice_6 and codice_7. Dot (command) In a Unix shell, the full stop called the dot command (.) is a command that evaluates commands in a computer file in the current execution context. In C Shell, a similar functionality is provided as the codice_1 command, and this name is seen in "extended" POSIX shells as well. The dot command is not to be confused with a dot file, which is a dot-prefixed hidden file or hidden directory. Nor