Question

1. Write a regular expressions that would match lines in text that contain word DATE: at the beginning of a line followed by actual date in format YYYY-MM-DD. Space between colon ( : ) and date may or may not exist.
2. In C, if you issue the following statement n << 2 where n is an integer, what will be value of n?
3. In bash, if you define variable var = “date” and issue a statement echo `$var`, what output will you get?
4. In bash script, if you issue command read a b c d and enter 1 22 3 44 5 66 7 88, what variables a, b, c, and d contain?
5. If you want to redirect output of a bash command into a file what operator will you use?
6. What does operator | mean in bash?
7. What variable $0 contains in gawk?
8. What variable $0 contains in bash script?
9. What the statement esac means in bash script?
10. If you would define a rule for creating a variable in C using regular expression, how would you write it?
11. If you need to skip statements in for or while loops and go to the next iteration, what statement will you use?
12. In respect to users and processes, how would you define Linux OS?
13. What the following regular expression means (\*|~){1,} ?
14. You friend notifies you that feature1 branch you are working on currently is updated on a GitLab server. What git command will you use to bring the updates to your local environment?
15. You want to replace all words people with students in file Lecture1. What sed command will you use?

Answer 1

For no space between colon (:) you can use \b(DATE)\b:\d{4}-\d{2}-\d{2} .If there is space between colon(:) simply put \s for space, therefore it becomes \b(DATE)\b\s:\s\d{4}-\d{2}-\d{2} .

You can use the table below to further modify your expression/pattern.

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