On Sun, May 26, 2002 at 02:23:58PM +0800, Huter.Liu wrote:
> hi,Vidiot!
> I know the arrow key and the letter key can move cursor quite
> well,but I'm wondering why not just use arrow key?so I think there's
> now arrow key in the old keyboard and the old vi have *NO* choice but
> use letter key to move cursor?who can give me a picture of the oldest
> keyboard??
No, not at all. Vi was developed using 'curses', which even then allowed
for terminals with many, many variants of keyboards. These are all described
in the single file /etc/termcap; do 'man termcap'.
However, various limitations in the algorithm--not the least of which
being the growing size of the flat termcap file--led to the development
of a replacement for curses called 'terminfo'. Terminal descriptions are
pseudo-compiled and stored in individual files in a directory tree structure;
do 'man terminfo'. You will notice a bewildering array of options and
capabilities.
Vi and terminfo are very mature programs at this point in their
lifecycyle. I very much doubt, if your arrow keys don't work, that
it's because they're not supported by terminfo. It's much more likely
that your terminal is misdescribed--check the TERM environment variable.
Check out 'tput'.
Cheers,
--
Dave Ihnat
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