Re: Why both ^[(B^[[m and ^[[m work on my terminal?

[Chris Page]

> On Jun 10, 2015, at 6:18 PM, Peng Yu <address@hidden> wrote:
> 
> What is the difference between ^[(B^[[m and ^[[m?

“ESC ( B” is the “SCS – Select Character Set” command for setting the character 
set to ASCII.

“ESC [ m” is the “SGR – Select Graphic Rendition” command for resetting the 
text attributes (color, style, etc.).

For xterm-256color, “sgr0” is defined to reset both the character set and the 
text attributes.

These codes are described in the VT100 manual

        http://www.vt100.net/docs/vt100-ug/chapter3.html#SCS
        http://www.vt100.net/docs/vt100-ug/chapter3.html#SGR

and in the XTerm documentation

        http://invisible-island.net/xterm/ctlseqs/ctlseqs.html

The reason it sends “ESC ( B” is in case some other character set is selected. 
A common issue is when the graphic character set for drawing lines and boxes is 
left selected when it shouldn't be. Resetting the character set ensures that 
new text is readable.

-- 
Chris Page