Shell Programming and Scripting

Question 1:
I want to store the result of prstat to a file.
If I write in this way: prstat -a >>prstat.log, the result of prstat is stored to the file prstat.log correctly;
but if I write it in this wayrstat -a |grep abc>>prstat.log
(abc is the name of a program since I only want to trace the information of this program), the prstat.log is always empty. what is wrong with the command? What is the right way to write the prstat result of abc to prstat.log?

Question 2:
I have a salaries machine with multiple CPU, and program abc is a single thread program so it only uses one CPU. How to know the CPU utility of abc in the CPU it uses? Currently I use prstat or top but they only shows CPU utility of abc in multiple CPUs.

Thanks,

Ad. 1:

Code:

prstat -a -c 1 | grep abc >> prstat.log

do not work, the file is still empty


I found the reason maybe prstat -a does not terminate itseld. In fact if I run:
pmap -x <PID> |grep heap >>pmap.log, the result is stored to the file.
the difference between prstat and pmap here is pmap only executes one time and then terminates; while prstat does not terminate until you stop it.

But still, I do not know how to store result of prstat to a file. Thanks

If you want only 1 prstat output, then this will work:

Code:

prstat -a -c 1 1 | grep abc >> prstat.log