Plan 9 from Bell Labs’s /usr/web/sources/contrib/someone/root/rc/bin/plumbman
#!/bin/rc for(i in `{man -w $*}){ x=`{echo $i | sed 's;/sys/man/(.*)/(.*);\1 \2;'} troff -N -man $i | uniq | plumb -i -d edit -a 'action=showdata filename=/man/'$x(2)^'('$x(1)^')' }