yank

#!/bin/bash
put() {
  esc=$1
  test -n "$TMUX" -o -z "${TERM##screen*}" && esc="\033Ptmux;\033$esc\033\\"
  printf "$esc"
}
put "\033]52;c;!\a"
buf=$( cat "$@" )
len=$( printf %s "$buf" | wc -c ) max=74994
test $len -gt $max && echo "$0: input is $(( len - max )) bytes too long" >&2
put "\033]52;c;$( printf %s "$buf" | head -c $max | base64 | tr -d '\r\n' )\a"
test -n "$TMUX" && tmux set-buffer "$buf" ||: