Question: 4. Using pipes, write a single line set of commands to find out how many times the echo command been used in the past 100

4. Using pipes, write a single line set of commands to find out how many times the echo command been used in the past 100 history lines and list the result in a file called echoCount in your home directory. 5. Explain, using examples, the purpose of the process control block (PCB) in the UNIX operating system. Give 2 examples of volatile and non-volatile data that are stored in the PCB

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