The config file for my compose key /usr/share/X11/locale/en_US.UTF-8/Compose lists all the key sequences for composing Greek letters; all of them require the pressure of a special dead_greek key. This is not a physical key of course, so, how can I assign an arbitrary key sequence to my compose key which produces this virtual dead_greek?

Also, I'd be interested to know if you have found a comfortable keyboard configuration regarding the compose key in general, and Greek letters in particular.

  • 1
    If your goal is to type polytonic greek, I think you're better off using ibus-m17n rather than the compose key. – chaskes Jun 15 '16 at 0:12
  • <dead_greek> is actually present in the "French (Bepo, ergonomic, Dvorak way)" keyboard layout. But have you tried to use any of the Greek keyboard layouts? – Gunnar Hjalmarsson Jun 15 '16 at 0:36
  • Note for others search for similar symbols, the Compose file can contain multiple definitions for a single character. For example, µ can be done with dead_greek, but it can also be done with compose key + u then /. – starbeamrainbowlabs Apr 20 at 21:24

To help anyone who stumbles here,

You need to configure ~/.XCompose (see full file below) and restart X session.

To type Greek letters on Latin keyboard:

  1. Hold compose key — usually it is right Alt (look for "Compose key location" in "Keyboard" sections in "System Settings"). <Multi_key> in the list below.
  2. Type g for small letters or G for CAPITAL letters. G stands for "Greek". Different capitalization for convenience
  3. Type the Latin alphabet equivalent.
  4. Release compose key.

You can see the list of compose sequences configured system-wide in file /usr/share/X11/locale/$LANG/Compose, where $LANG is environment variable for current locale (for US English, it is equal to en_US.UTF-8):

$ cd /usr/share/X11/locale/$LANG/
$ less Compose

To enable compose for Greek alphabet add to your ~/.XCompose file:

<Multi_key> <G> <A> : "Α"    U0391    # GREEK CAPITAL LETTER ALPHA
<Multi_key> <G> <B> : "Β"    U0392    # GREEK CAPITAL LETTER BETA
<Multi_key> <G> <G> : "Γ"    U0393    # GREEK CAPITAL LETTER GAMMA
<Multi_key> <G> <D> : "Δ"    U0394    # GREEK CAPITAL LETTER DELTA
<Multi_key> <G> <E> : "Ε"    U0395    # GREEK CAPITAL LETTER EPSILON
<Multi_key> <G> <Z> : "Ζ"    U0396    # GREEK CAPITAL LETTER ZETA
<Multi_key> <G> <H> : "Η"    U0397    # GREEK CAPITAL LETTER ETA
<Multi_key> <G> <I> : "Ι"    U0399    # GREEK CAPITAL LETTER IOTA
<Multi_key> <G> <K> : "Κ"    U039A    # GREEK CAPITAL LETTER KAPPA
<Multi_key> <G> <L> : "Λ"    U039B    # GREEK CAPITAL LETTER LAMDA
<Multi_key> <G> <M> : "Μ"    U039C    # GREEK CAPITAL LETTER MU
<Multi_key> <G> <N> : "Ν"    U039D    # GREEK CAPITAL LETTER NU
<Multi_key> <G> <P> : "Π"    U03A0    # GREEK CAPITAL LETTER PI
<Multi_key> <G> <R> : "Ρ"    U03A1    # GREEK CAPITAL LETTER RHO
<Multi_key> <G> <S> : "Σ"    U03A3    # GREEK CAPITAL LETTER SIGMA
<Multi_key> <G> <T> : "Τ"    U03A4    # GREEK CAPITAL LETTER TAU
<Multi_key> <G> <U> : "Υ"    U03A5    # GREEK CAPITAL LETTER UPSILON
<Multi_key> <G> <F> : "Φ"    U03A6    # GREEK CAPITAL LETTER PHI
<Multi_key> <G> <X> : "Χ"    U03A7    # GREEK CAPITAL LETTER CHI
<Multi_key> <G> <O> : "Ω"    U03A9    # GREEK CAPITAL LETTER OMEGA

# DOUBLES (additional stroke <Q>)
<Multi_key> <G> <Q> <T> : "Θ"    U0398    # GREEK CAPITAL LETTER THETA
<Multi_key> <G> <Q> <O> : "Ο"    U039F    # GREEK CAPITAL LETTER OMICRON
<Multi_key> <G> <Q> <X> : "Ξ"    U039E    # GREEK CAPITAL LETTER XI
<Multi_key> <G> <Q> <P> : "Ψ"    U03A8    # GREEK CAPITAL LETTER PSI

# greek small letters
<Multi_key> <g> <a> : "α"    U03B1    # GREEK SMALL LETTER ALPHA
<Multi_key> <g> <b> : "β"    U03B2    # GREEK SMALL LETTER BETA
<Multi_key> <g> <g> : "γ"    U03B3    # GREEK SMALL LETTER GAMMA
<Multi_key> <g> <d> : "δ"    U03B4    # GREEK SMALL LETTER DELTA
<Multi_key> <g> <e> : "ε"    U03B5    # GREEK SMALL LETTER EPSILON
<Multi_key> <g> <z> : "ζ"    U03B6    # GREEK SMALL LETTER ZETA
<Multi_key> <g> <h> : "η"    U03B7    # GREEK SMALL LETTER ETA
<Multi_key> <g> <i> : "ι"    U03B9    # GREEK SMALL LETTER IOTA
<Multi_key> <g> <k> : "κ"    U03BA    # GREEK SMALL LETTER KAPPA
<Multi_key> <g> <l> : "λ"    U03BB    # GREEK SMALL LETTER LAMDA
<Multi_key> <g> <m> : "μ"    U03BC    # GREEK SMALL LETTER MU
<Multi_key> <g> <n> : "ν"    U03BD    # GREEK SMALL LETTER NU
<Multi_key> <g> <p> : "π"    U03C0    # GREEK SMALL LETTER PI
<Multi_key> <g> <r> : "ρ"    U03C1    # GREEK SMALL LETTER RHO
<Multi_key> <g> <s> : "σ"    U03C3    # GREEK SMALL LETTER SIGMA
<Multi_key> <g> <t> : "τ"    U03C4    # GREEK SMALL LETTER TAU
<Multi_key> <g> <u> : "υ"    U03C5    # GREEK SMALL LETTER UPSILON
<Multi_key> <g> <f> : "φ"    U03C6    # GREEK SMALL LETTER PHI
<Multi_key> <g> <x> : "χ"    U03C7    # GREEK SMALL LETTER CHI
<Multi_key> <g> <o> : "ω"    U03C9    # GREEK SMALL LETTER OMEGA

# doubles (additional stroke <q>)
<Multi_key> <g> <q> <t> : "θ"    U03B8    # GREEK SMALL LETTER THETA
<Multi_key> <g> <q> <o> : "ο"    U03BF    # GREEK SMALL LETTER OMICRON
<Multi_key> <g> <q> <p> : "ψ"    U03C8    # GREEK SMALL LETTER PSI
<Multi_key> <g> <q> <s> : "ς"    U03C2    # GREEK SMALL LETTER FINAL SIGMA
<Multi_key> <g> <q> <x> : "ξ"    U03BE    # GREEK SMALL LETTER XI

See also:

Most used letters can also be set up with separate compose key combinations. For example, π:

<Multi_key> <p> <i> : "π"    U03C0    # GREEK SMALL LETTER PI

You can also save this list in a file called GreekCompose and use include command in ~/.XCompose:

include "%L"
include "/path/to/GreekCompose"

The list above was created by manually adjusting output of small Python script:

Do xmodmap -pke | grep dead_greek

If there's no output, you don't have a key representing dead_greek.

You can assign one. For example, I just assigned the right Alt key to dead_greek:

xmodmap -e 'keycode 108 = dead_greek Meta_R Alt_R Meta_R'

and now I can type ralt a ralt b ralt g and it comes out as αβγ.

  • I just tried that, works kinda cool. But if I keep AltGr pressed down, the keyboard generates a flood of µ. Also I lose the handy keystrokes for typing €, ĸilo, ¢ and the back-quote. – davide Sep 16 '16 at 11:45

Not a perfect solution, perhaps, but I used

xmodmap -e "keycode 191 = dead_greek dead_greek dead_greek dead_greek"

This mapped the F13 key on my keyboard to dead_greek (the four repeats are for different combinations of SHIFT and ALTGR with F13). The number 191 comes from looking at the output of xev | sed -ne '/^KeyPress/,/^$/p' when pressing F13 (it shows keycode 191).

  • I would have liked to map dead_greek to the SUPER_R key on my Apple keyboard, but this seems harder to do because Ubuntu grabs SUPER_R for the Unity menu, and SUPER_R and SUPER_L seem to be merged somewhere. More work needed to figure it out. – jdpipe Mar 4 '17 at 3:19
  • I like your clever method. Only thing is, I can't get my mapped dead_greek key to give me greek. my Compose file has dead_greek definitions, 'xmodmap -pke | grep dead_greek' gives me 'keycode 152 = dead_greek dead_greek dead_greek dead_greek' but when I tap the 152 key and then 'a,' I get 'a.' Can you point me in the right direction? – Geoffrey Wheeler Oct 31 '17 at 9:22
  • 1
    Try playing around with other keys instead, to see if that's your problem? – jdpipe Nov 3 '17 at 2:15
  • I tried [F9] and F[10] and they didn't work. I have to find a strategy to solve this problem. I tap the dead_greek key and then I tap 'a' That's how my Compose key works. Let me map dead_greek to that key and see what happens. – Geoffrey Wheeler Nov 3 '17 at 10:05
  • 1
    OK, I've mapped to to my Pause/Break key; it works in LibreOffice and my web browser. I was testing it in the terminal and Notepadqq and it doesn't work in those two places. I think there is probably an encoding in Notepadqq that it will work with. Thanks for your encouragement. – Geoffrey Wheeler Nov 3 '17 at 10:45

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