biff y --- chmod o+x /dev/tty (doesn't work on turing
because incoming mail arrives on hypatia)
biff n --- chmod o-x /dev/tty (doesn't work on turing
because incoming mail arrives on hypatia)
from --- (missing)
groups --- (missing)
hostid --- sysdef -h
hostname --- uname -n
lpq --- lpstat
lpr --- lp
lprm --- cancel
printenv --- env
rusage --- (missing)
tset --- (missing)
uptime --- who -b
users --- who -q
whereis --- (missing)
whoami --- id