Backspace

[Derek Ragona]

At 01:45 AM 8/13/2007, d.Z. wrote:
>Thanks for helping everybody.
>
>But actually I'm using Bourne shell on FreeBSD 6.1 just like the
>Solaris in lab, and the FreeBSD is freshly installed, I have checked
>.shrc and .profile, but nothing related to key bindings or stty's
>there, so what I thought it should be is:
>
>after I login -> [press backspace] -> ^H appears -> [press DEL] -> ^? appears
>in emacs -> [press backspace] -> oops, help appears
>
>I think Solaris was just like the above. But in my FreeBSD, things go like:
>
>after I login -> [press backspace will erase last char] -> [press DEL
>does the same thing]
>no matter what have I done to "stty" like "stty erase ^H" and "stty
>erase2 ^H", the result is just the same, backspace and DEL still can
>be used to erase last char in shell. The only difference is in emacs,
>but I searched the net and found that emacs relies on its own
>definition of key bindings in ~/.emacs file (it is empty in this
>case), rather than the terminal key bindings. Totally confused.
>
>Any idea? Thanks again for you kind people.

Programs like emacs generally use terminfo and termcap databases that 
define keys and other terminal capabilities.  Generally these are different 
between various UNIX's.  You can learn more by just doing a man on these:
man terminfo
man termcap

         -Derek


>2007/8/13, Jerry McAllister <jerrymc at msu.edu>:
> > On Sun, Aug 12, 2007 at 01:31:36PM -0500, Derek Ragona wrote:
> >
> > > At 10:54 PM 8/11/2007, d.Z. wrote:
> > > >Hello,
> > > >
> > > >I'm a new user to FreeBSD and Unix. I used Solaris 10 last week in
> > > >lab, and found there is a difference between them.
> > > >
> > > >When Solaris is installed, press backspace will give you ^H, you'll
> > > >have to "stty erase ^H" to solve this problem. But with FreeBSD 6.1,
> > > >when first installed, backspace is always bounded to erase last
> > > >character, even I have "stty erase ^?" and "stty erase2 ^?", backspace
> > > >still deletes last character input. Does any body know why is this
> > > >happening?
> > >
> > > Solaris by default uses csh for user accounts.  The backspace key
> > > assignment and for that matter, all key assignments are dependent on the
> > > both the shell and terminal definition.  Reassigning keys is typical for
> > > your shell's startup profile file .cshrc for csh and .bashrc for bash.
> > >
> > >
> > > >And strange thing is with default setting (before stty erase and
> > > >erase2 to ^?), when I use Emacs, C-h will give me back space, instead
> > > >of help. I know this is desirable for experts, but I'm really new so
> > > >just want to follow the instruction first.
> > >
> > > Applications like the shell you use interpret the terminal definition and
> > > may or may not use the same key assignments.  Most applications like the
> > > shells in UNIX environments have startup files to customize the key
> > > assignments and in the case of editors even define macros.
> >
> > And those startup files are:
> >
> >    For csh and tcsh  (tcsh is the most common one in FreeBSD)
> >    the startup file is .cshrc  in one's home directory.  You can also
> >    create a system-wide one.
> >
> >    For SH and bash it is .profile  and for them don't forget to export
> >    any variables.
> >
> > ////jerry
> >
> > >
> > > Hope this helps.
> > >
> > >         -Derek
> > >
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