ksh on aix?

[Steve Dyer]

AIX PS/2's setpgrp() is the Sys V setpgrp.  You want to call instead
setpgid(pid, pgrp), which has the same calling sequence as BSD4.3's setpgrp.

If you DON'T do this, and mistakenly call setpgrp(), you'll get the problems
you report ("open" command not working, etc.)

-- 
Steve Dyer
dyer at ursa-major.spdcc.com aka {ima,harvard,rayssd,linus,m2c}!spdcc!dyer
dyer at arktouros.mit.edu, dyer at hstbme.mit.edu