TROFF= vtroff -t print: trofftxt vpr -t trofftxt troff: /usr/ucb/soelim pxin?.n | tbl | ${TROFF} trofftxt: fig2.3.n /usr/ucb/soelim pxin?.n | tbl | /usr/ucb/vtroff -t >trofftxt fig2.3.n: fig2.3.raw sort fig2.3.raw >fig2.3.n