The top command calculates Cpu(s) by looking at the change in CPU time values between samples. When you first run it, it has no previous sample to compare to, so these initial values are the percentages since boot. It means you need at least two loops or you have to ignore summary output from the first loop. This is problem for example for batch mode. There is a possible workaround if you define the CPULOOP=1 environment variable. The top command will be run one extra hidden loop for CPU data before standard output.
So, naturally I tried
Code:
top -b -n 2 -U $USER
as well as
Code:
CPULOOP=1
top -b -n 1 -U $USER
but both of those still fail.
Does anyone know what is going on? Should I file a bug report?
Also occurs on SLES 10.1 with procps-3.2.6-18.7. Yeah, I'd go ahead and report the bug (or obtain the source code and attempt to debug it if you are so inclined).
Incidentally, you may already be aware but as a workaround you can do this to ensure your script carries on its merry way without having to turn off set -e:
Incidentally, you may already be aware but as a workaround you can do this to ensure your script carries on its merry way without having to turn off set -e:
Code:
top -b -n 1 -U $USER || true
Thats clever, and it works! It is what I use now.
I was thinking that there had to be some way to suppress the exit code, thanks.
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