Practice 5Question 1 (15)Describe the meaning for each regular expression below. For eachexpression, give 3 different examples that match the pattern.a) /^[A-Z]..$/ b) /^[A-Z][a-z]*3[0-5]/ c) /^[A-Za-z]*[^,][A-Za-z]*$/Question 2: (20) (Grep/egrep exercise)Given the file 'databook' (you can download it from websitehttp://www.cs.gsu.edu/~chunyuai/3320/hw/databook) containing the lines of the following format:Type first-name last-name email-addressDo the following queries:a. Print all lines containing the string CS4520.b. Print all lines where the person's first name starts with J.c. Print all lines that contain .comd. Print all lines containing an upper-case letter, followed by fourlower-case letters, a space and one uppercase letter.Question 3: (20) (sed exercise)Use the file 'databook', do the following queries:a. Change Dumitru's name to Dima.b. Delete the first 3 line.c. Print all lines where the email address contains @student.gsu.edud. Replace the line containing "CS2010" with "NULL NULL NULL NULL".Question 4: (15) (awk exercise)Use the file 'databook1' as database(http://www.cs.gsu.edu/~chunyuai/3320/hw/databook1). The file contains the lines of the following format:Type first-name last-name email-addressDo the following queries:a. Print all email address.b. Print Dumitru's name and email address.c. Change the type with the following rule:If line number modulo 3 is 1, the type field should be changed toCS4520. If line number modulo 3 is 2, the type field should be changed toCS2210. Otherwise keep the original type field.Question 5: (10) (Exercise for transforming files)Write a command that archives and compresses the contents of a file, and writes the result to a new file. What is the corresponding command to extract it to produce the original file?Question 6: (10) (Exercise for searching files)Write a command to find files in a directory hierarchy (e.g.your home directory) that have the name pattern '*.txt" and compressthem.Question 7: (10) (Exercise for sorting files)Write a command pipeline to list files in a directory hierarchy (e.g.your home directory) that have the name pattern '*.txt" and sort them byfile
View Full Document
Unlocking...