|Summary:||how to set meta-delete key binding|
|Product:||[Retired] Red Hat Linux||Reporter:||Joe Harrington <jhmail>|
|Component:||tcsh||Assignee:||Eido Inoue <havill>|
|Status:||CLOSED DEFERRED||QA Contact:|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||1999-09-02 18:08:08 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Joe Harrington 1999-06-04 20:21:08 UTC
I've been trying to set the key binding for meta-delete. I'm running in an xterm and have used xmodmap to cause both backspace and delete to issue delete (0xff) in vt100-type windows. This fixes a lot of things and the only thing that this breaks is meta-backspace in tcsh. So I need to set meta-delete in tcsh but tcsh appears not to allow it to be set. The tcsh man page states that delete is given as ^? and that you can say bindkey -b 'M-<keyname>' <command> to set meta keys. However: % bindkey -b 'M-^?' backward-delete-word Bad key spec M-^? If I use ^V to quote the meta-delete sequence, I get ^H, which is backspace (0x08), not delete (0xff). Using ^H in any bindkey command affects backspace but not delete. Doing just bindkey to list the sequences lists a bunch of meta sequences like "^^g". Perhaps one of these is what I want but I have no way of knowing which of those sequences corresponds to meta-delete, nor do I know how to generate them. Cutting and pasting them works to some windows, but not to shell windows. The man page tells you how to set delete and anything with a meta in front of it, but combining those rules does not work. Please fix, or suggest (and document in the man page) another way. Thanks!
Comment 1 Jeff Johnson 1999-06-05 16:11:59 UTC
Have you tried entering the command all in ascii? By that I mean instead of trying to get the code \0xff into the command, try the key sequence M - ^ caret ? question mark when entering your bindkey command? ------- Email Received From Joe Harrington <firstname.lastname@example.org> 06/07/99 11:57 -------
Comment 2 Joe Harrington 1999-06-07 16:05:59 UTC
(Here's the contents of the email I sent. Sorry, I thought it would appear in the dialog.) Yes I tried, no it doesn't work. Trying this suggestion will show that it produces the following error message: % bindkey -b 'M-^?' backward-delete-character Bad key spec M-^? I tried both the quoted key sequences and the ascii equivalents for ^?, ^H, ^h, ^_, M-DL, M-DEL, M-0xff, and all of the "untypable" foreign characters that show up when you do bindkey without arguments, by cut-and-paste from the window. Apparently bindkey -b limits the sequence to three characters, and they have to be printable. The sequence 'M-C-s' fails, for example. My belief is that there is an anti-loophole in the key codes for bindkey: You can only tell bindkey to use "meta" in the -b format, and you can only tell bindkey about delete using ^?. This latter sequence is documented but is disallowed by the -b format, so meta-delete isn't possible. DEL is the only ascii sequence that is not printable and that is not in the first ascii register (values 0x00 - 0x1f). A very easy fix to code would be to extend the -b option to include 1) the standard ASCII two- and three-letter expansions of the control characters (NUL, SOH, STX, etc.), 2) Multiple "shift"-style prefixes (M-C-x), and/or 3) hex values in the "0x" format (M-0xff).
Comment 3 Jeff Johnson 1999-09-02 18:08:59 UTC
This won't be in Red Hat 6.1. I'm preserving the bug by changing the state to REMIND.