Introduction. A computer system consists of hardware system programs application programs. History of Operating Systems (1). Early batch system bring cards to 1401 read cards to tape put tape on 7094 which does computing put tape on 1401 which prints output. Computer Hardware Review (1).
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Early batch system
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A fully featured modern operating system
It is available in a variety of “flavors.”
It’s comprised of simple tools that perform a single function well.
These tools can be used together to perform complex tasks.
Man(manual) -- Documentation is your friend
Every Unix process automatically comes with three file handles or descriptors.