All, for your edification, some PDP-7 Unix programs running under the user-mode simulator (no working kernel as yet). Cheers, Warren @ ls -l 10271 drwr- 02 750 10000 . 10301 drwr- 12 750 10000 .. 10311 srwr- 01 750 05761 as 10321 lrwr- 01 750 11433 cat.s 10331 srwr- 01 750 00325 chmod 10341 srwr- 01 750 00325 chown 10351 srwr- 01 750 00212 chrm 10361 srwr- 01 750 00473 cp 10271 srwr- 01 750 01114 date 10301 srwr- 01 750 02734 ds 10311 srwr- 01 750 00023 hello 10321 srwr- 01 750 00173 ln 10331 srwr- 01 750 01510 ls 10341 srwr- 01 750 00173 mv 10351 srwr- 01 750 07120 opr.s 10361 srwr- 01 750 01645 sh 10271 srwr- 01 750 01106 stat [inum perms ln uid size name] @ date Mon Mar 09 1970 23:37:44 @ as opr.s cat.s I II opr.s cat.s @ mv a.out cat @ cat hello hello ken and doug