COMP111 Lab Session 4

The trick is that the delimter is '*' which is a metacharacter for UNIX and thus has to be single-quoted.

Sort the file in ascending order according to the year of entry of the students.

cut -d '*' -f2 lab4.data | sort -n

Output student IDs which are duplicated in the file, as in the following:

cut -d '*' -f2 lab4.data | sort -n | uniq -d

List the most popular last name and the number of students using that last name, as in the following:

   6 Chan

cut -d ' ' -f1 lab4.data | sort | uniq -c | head -1

How many domain names are used in the email addresses (the part after the @ sign). Generate the output as in the following:

  11 cs.ust.hk
   9 home.ust.hk
   5 ismt.ust.hk
   5 stu.ust.hk

cut -d '@' -f2 lab4.data | sort | uniq -c

Put the commands and the output into lab4.out.

Finally, mail "lab4.out" to the lab TA.

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