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In xterm, when I press alt-backspace, xterm produces the Unicode character 'LATIN SMALL LETTER Y WITH DIAERESIS' (U+00FF) as described here. It shows up on-screen as a 'y' character with two dots above it.

What component, code or configuration causes this particular Unicode sequence to be emitted when alt-backspace is typed? terminfo? Is it hard-coded in xterm? Xkb? Something else?

I'd appreciation any pointers to configuration files, man pages, source code, and so forth. Thanks.

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2 Answers 2

Reset to default
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You wanted a man page?

man xterm

   eightBitInput (class EightBitInput)
           If  “true”,  Meta  characters (a single-byte character combined
           with the Meta modifier key) input from the  keyboard  are  pre‐
           sented  as a single character, modified according to the eight‐
           BitMeta resource.  If “false”, Meta  characters  are  converted
           into  a  two-character  sequence with the character itself pre‐
           ceded by ESC.  The default is “true”.

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put arrow in middle of term then keep pushed Ctrl+left mouse button and in menu check option "Meta send escape"

edit file /etc/X11/app-defaults/XTerm add this line at the end

*metaSendsEscape: True

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