Usando pontos numéricos de código
Na resposta de Tobu, acredito que a combinação de teclas nos teclados dos EUA ou do Reino Unido seria chamada Ctrl + Shift como em "Ctrl-Shift-2702 é para o caractere de tesoura (✂) ".
Pessoalmente, acho muito mais fácil lembrar de digrafos.
Digrafos / Tecla Composta / Multi-Chave
X11 Modmap
O sistema X Window (X11) fornece o que às vezes é chamado de uma chave de composição que permite a entrada de caracteres especiais usando digrafos.
Keying the combination Shift+AltGr (in that order), releasing these keys, then entering two other keys will produce a special character. Many of these will be the reasonable result of overtyping the character keys, eg.
Shift+AltGr ~ a --> ã (ã in HTML) Shift+AltGr / o --> ø (ø in HTML) Shift+AltGr o c --> © (© in HTML) Shift+AltGr c o --> ǒ (Ŏ in HTML)
Como
Existe um artigo em linuxquestions.org que descreve como configurar isso.
first you need to choose which key you want to be the Compose key. Then, open a terminal and enter the command
xev
. A window called "Event Tester" will pop up. Make sure that it's focused by clicking on it and leaving the mouse cursor in it.Now press and release the key that you want to become the Compose key. Remember or write down the number after the word "keycode" in the output
Now open the file ".Xmodmap" (the name begins with a dot) in your home directory (create it if it isn't there already) with a text editor and type in the following line, replacing with the number you got in xev.
keycode <keycode number> = Multi_key
Now, open the file .xinitrc (it's in your home directory, and it's a hidden file) in a text editor. Insert this line in the beginning of the file:
xmodmap ~/.Xmodmap
And next time you log in the Compose key should work! To start using the Compose key right now, enter the commandxmodmap ~/.Xmodmap
in a terminal.
Wikipedia
O artigo do howto se refere a um artigo da wikepdia que diz
The compose key is known as "Multi_key" in the X Window System, and must be interpreted by the client program (typically Xlib), not the server. In XFree86 and X.Org Server, many keyboard layouts have a variant that maps Multi_key to some key, usually (on PC keyboards) to either of the Windows keys, or sometimes ⇧ Shift+AltGr[1] or ⇧ Shift+Right-Ctrl. It can also be specified in XkbOptions (for example, "compose:rwin"). Multi_key can also be assigned with the xmodmap(1) utility.