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All modern operating systems use concurrency.
The introductory definitions and ideas in the book are important.
The various forms of hardware (MIMD and SIMD) and FORTRAN based concurrency can be ignored. Take our advanced architecture courses for this and/or talk to Dr. Gomez.
You need to understand
http://cse.csusb.edu/dick/cs320/sieve/ ] [ http://cse.csusb.edu/dick/cs320/crypto/ ]
ls|wc -llists files and counts them. (ls =list, wc -l = count lines)
ls|grep 320|wc -llist files, filters out those with '320' in the name and counts them.
grep -l 320 *|wc -lcounts the number of files with '320' inside them.
ps -elf|grep $USERlists all processes and filters out those with your name in them... including the two processes 'ps -elf' and 'grep'.
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