Student OPS224 Name Student Number
Quiz #2: Basic Scripting _________________________________ _________________________
Multiple Choice (5 Marks) Circle the letter that provides the most appropriate answer to the following questions ( mark will be deducted for incorrect answers). 1.
The command grep for < file1 >> file2 will: a. b. c. d. Match lines with the pattern for in file2. Match lines with the pattern for in file1 and redirect standard error to file2. Match lines with the pattern for in file1 and overwrite file2 Match lines with the pattern for in file1 and append standard output to file2
2.
What will the following command do? $ cat a b 2>&1 > error
a. b. c. d.
Redirect just standard output to the file error. Redirect both standard output and standard error to the file error. Redirect standard output to file error and standard error to the terminal. Redirect just standard error to the file error.
3.
If the following commands are issued (in order of appearance): $ set books paper pens erasers binders calculators diskettes $ shift 4 $ echo $2 What will be displayed? a. b. c. d. calculators diskettes binders erasers
4.
Which of the following is not a valid user-created variable? a. b. c. d. v134_54455 1dff_345_1_ xx7_4_5_667 www_cs_org
Multiple Choice / Continued
5.
Please note the contents of the script display_me (shown below): $ cat display_me one=$2$1 set one two three echo $1$one$2 Assume that you are in the bash shell. What will be the display if the command bash display_me it is Friday is issued? a. b. c. d. onetwothree oneisitthree oneisitit oneisittwo
Short Answer
(5 Marks)
Write a portable bash shell script called show_me that will accept three arguments after the script name and perform the following tasks: Assume you have issued the following command: $ bash show_me all the money Please enter your full name: Murray Edward Saul *** Report for Murray Edward Saul *** Here are your arguments backwards: money, the, all Write your shell script below (ignore error-checking, but include at least 3 comments)