Editing Box-drawing characters (section)

===Unix, CP/M, BBS===
On many [[Unix]] systems and early dial-up [[bulletin board system]]s the only common standard for box-drawing characters was the [[VT100]] alternate character set (see also: [[DEC Special Graphics]]). The [[escape sequence]] <code>Esc&nbsp;(&nbsp;0</code> switched the codes for lower-case ASCII letters to draw this set, and the sequence <code>Esc&nbsp;(&nbsp;B</code> switched back:

{| class="wikitable"
! !!0!!1!!2!!3!!4!!5!!6!!7!!8!!9!!A!!B!!C!!D!!E!!F
|-
!6
| || || || || || || || || || ||┘||┐||┌||└||┼|| |
|-
!7
| ||─|| || ||├||┤||┴||┬||│|| || || || || || || |
|}

On some terminals, these characters are not available at all, and the complexity of the escape sequences discouraged their use, so often only [[ASCII]] characters that approximate box-drawing characters are used, such as -&nbsp;([[hyphen-minus]]), |&nbsp;([[vertical bar]]), _{{nbsp}}([[underscore]]), ={{nbsp}}([[equal sign]]) and +&nbsp;([[plus sign]]) in a kind of [[ASCII art]] fashion.

Modern Unix [[terminal emulator]]s use Unicode and thus have access to the line-drawing characters listed above.