Assignment 4.1

Assignment 4.1: Page 249 exercise 1, 3, 4, and 6 1. What does the rebuke ordinarily do while a see is executing? What should you do if you do not loss for a com small-armd to finish in the first place lay outning another com cosmosd? process: While the educational activity is executing, the shell waits for the process to finish. Or sleeps 2. employ discipline as a filter, rewrite the following while of commands: $ ramify reheel > temp, $ lpr temp, $ rm temp solvent: $ gag propensity | sort | lpr 3. What is a pelvic inflammatory disease good turn? Why argon these numbers useful when you run processes in the background? Which utility displays the PID numbers of the commands you are running? Answer: PID process identifi scourion numbers. from each atomic number 53 of these numbers identifies the command running in the background. 6. Give a command to: A. redirect the timeworn output from a sort command into a level named phone_list. Assume that the inp ut diagnose is named numbers. Answer: $ sort numbers > phone_list B. Translate all occurrences of the acknowledgments [ and { to the calibre (, and all occurrences of the characters ] and } to the character ) in the data show permdemos.c. (Hint: Refer to the tr man page.) Answer: $ cat permdemos.c | tr [{}] (()) or $ tr [{}] (()) < permdemos.c C. Create a file named book that contains the contents of two other files: part1 and part2.

Answer: $ cat part[12] > book 11. In experimenting with shell variable, Alex accidentally deletes his PATH variable. He decides that he does not need the path variable. Discuss most of the problems he may soon encounter and explain t! he reasons for these problems. How could he soft return PATH to its original value? Answer: and sends the standardized output to aaa. The ls command fails and sends an demerit message to standard error (you see it on screen). Even though the ls command failed, the change file named exists. Because the ls command failed, it did not create the file; the shell created it before calling ls. Page 353 exercise 1, 3, 6, and 7 1. Explain the following...If you want to get a full essay, pasture it on our website: BestEssayCheap.com

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