Xterm

References

• Xterm on archlinux

Examples

Change the default window size:

• Add/Edit this line to file ~/.Xdefaults:

 xterm*vt100.geometry:150x50+100+100

• Merge it in X database:

 % xrdb -merge ~/.Xdefaults

• Configure xterm fonts, colors, size. Edit ~/.Xresources:

XTerm*foreground: rgb:00/00/00
XTerm*background: rgb:ff/ff/dd
Xterm*saveLines: 4096
xterm*faceName: DejaVu Sans Mono:size=12
xterm*VT100.geometry: 132x40

... then update X resource database:

xrdb ~/.Xresources

Enable 24-bit Truecolor support

There are lot of discussion about true color and italic support in the terminal. Below the list of relevant posts.

• morhetz/gruvbox wiki -- Terminal specific
• neovim/neovim -- FAQ
• XVilka/TrueColour.md -- Colours in terminal
• How to enable true-color for neovim, tmux, and gnome-terminal
• neovim/neovim -- Italics aren't displaying properly #3461
• neovim/neovim -- Get funny chars on terminal #3462

All in all the solution for me involved to at least:

• Upgrade to Ubuntu Xenial 16.04, to get newest Gnome Terminal and Terminator/gtk3 on recent VTE.
• Upgrade to tmux 2.2 (only if using tmux).
• Do a total reset of the account configuration.
• Fiddle a bit with the terminfo (still not sure what was the exact recipe though).
• In Vim/Neovim, use gruvbox as theme (not solarized, which does not work in terminal — now patched!).

To test, first verify that the color theme works correctly in gvim.

Terminals

List of terminals that support 24-bit true colors:

• Gnome-Terminal
• Gnome-Terminator

Test true-color support

Run the script[1]:

awk 'BEGIN{
    s="/\\/\\/\\/\\/\\"; s=s s s s s s s s;
    for (colnum = 0; colnum<77; colnum++) {
        r = 255-(colnum*255/76);
        g = (colnum*510/76);
        b = (colnum*255/76);
        if (g>255) g = 510-g;
        printf "\033[48;2;%d;%d;%dm", r,g,b;
        printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
        printf "%s\033[0m", substr(s,colnum+1,1);
    }
    printf "\n";
}'

Or more:

• 24-bit-color.sh
• color-spaces.pl
• A true color image viewer in terminal!

Italics

Run the following to see if your terminal support italics:

#! /bin/bash

echo "Using tput      : " $(tput sitm)italics$(tput ritm)
echo "Using ANSI codes: " $'\e[3mitalics\e[23m'