Xresources
From Attie's Wiki
Below is the entire contents of my '~/.Xresources' file:
! Xterm stuff
XTerm*background: black
XTerm*foreground: white
XTerm*cursorColor: white
XTerm*scrollBar: false
XTerm*saveLines: 200000
XTerm*vt100.geometry: 120x40
Or for a 1920x1080 'ready' terminal, use:
XTerm*vt100.geometry: 280x70
Or for a side-by-side ready terminal use:
XTerm*vt100.geometry: 140x70