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getting whole output from 'ps'



I've got some system magic happening here I can't figure out.  I have a very 
simple one line sh script on an HP/UX box that simply does a ps, then greps 
through the command information to determine process id's.

I moved the same script to OSFV3.2a and it doesn't work.  One thing I did find 
is that if I run the 'ps' one-liner from the command line in an xterm window 
where part of the command column runs off the right of the window, it doesn't 
work. BUT, if I widen the size of the xterm so that the whole command is in 
view (the parts I'm grep'ing for), the script works.

I've used my own script, and a modified version of the 'ps' one-liners found in 
most of the /sbin/init.d scripts, but neither work.  My xterms don't word wrap 
and the HP xterm does.  But it seems to me that xterm (or ttys settings?) 
shouldn't have anything to do with it. What am I missing? 

thanks,
dan