rxvt-unicode font size
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It is simple to change the font size of rxvt-unicode via an entry in ~/.Xdefaults:
URxvt*font: xft:DejaVu Sans Mono-8
But it is also possible to change the font on the fly via this escape sequence:
printf '\33]50;%s\007' "xft:DejaVu Sans Mono-8"
While playing around with that I also found out that it is very simple to change the font of any other terminal you know the PID of, by just doing something like:
printf '\33]50;%s\007' "xft:DejaVu Sans Mono-8" > /proc/$pid/fd/0
where $pid is the process id of the shell you are running.