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this works for a Linux based system, other UNIX systems may have other way(s) to check the number of CPUs.
There is 1 alternative - vote for the best!
/proc/cpuinfo contains information about the CPU.
Search for "processor" in the /proc/cpuinfo file
wc -l, counts the number of lines.
All Linux Systems I try also have an empty line per cpu in /proc/cpuinfo... little shorter then...
If you can do better, submit your command here.
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