QQ11@LIVERPOOL.AC.UK (08/11/90)
I have a simple csh script which ran without any problems at HP-UX 3.1 on our 9000/850. However at 7.0 the behaviour is different. The different behaviour has proved consistent enough for me to seek help from you. The script fetches a file from another system every 24 hours and the script is started by cron(1M). The process waits until the file arrives. If for some reason the transfer has not taken place 24 hours later, I want the earlier process killed. The following line of code is used to find the old PID. set exists=`ps -uqq11 | awk '$4 == "getus.csh" && $1 != x { print $1 }' x=$$ -` This looks for the PIDs of the program and finds the older one if it exists (if it is found kill(1) is used). This worked fine at HP-UX 3.1 but at 7.0 a "spurious" PID is found (presumably as a result of executing part of the above pipe). The resulting kill(1) fails since the process is already dead. Here is output of ps -uqq11 in same script before the pipe: 11752 ? 0:00 sh 11942 ? 0:00 ps 11764 ? 0:00 getus.csh I would be grateful if any HP-UX 7.0 guru can explain precisely what is happening i.e. why does the other process get included at 7.0 and not at 3.1 (for 9000/300 fans, HP-UX 3.1 on the 800 was similar to 6.5 on the 300s). While I'm aware that I can do the whole thing differently (send *good* suggestions to me if you want :-)), I'd like to get to the root of the problem. Thanks. Alan Thew University of Liverpool Computer Laboratory Bitnet/Earn: QQ11@LIVERPOOL.AC.UK or QQ11%UK.AC.LIVERPOOL @ UKACRL UUCP : ....!mcsun!ukc!liv!qq11 Voice: +44 51 794 3735 Internet : QQ11@LIVERPOOL.AC.UK or QQ11%LIVERPOOL.AC.UK @ NSFNET-RELAY.AC.UK