What will be the output of the command sort -n file1.txt file2.txt | awk '!seen[1]++ {print 1, 2, 3}' given the following content of file1.txt and file2.txt? | file1.txt | file2.txt | |---|---| | 101 John Doe | 102 Michael Johnson | | 103 Jane Smith | 103 Jane Smith | | 105 Emma Brown | 106 Lily Evans | | 107 William Harris | 107 William Harris | | 109 Oliver Lewis | 110 Sophia Turner |

(A) Option figure from the original question paper

(B) Option figure from the original question paper

(C) Option figure from the original question paper

(D) Option figure from the original question paper

!/usr/bin/awk -f { for (i = 1; i <= NF; i++) { word = tolower($i) gsub(/[^a-z]/, "", word) if (word != "") freq[word]++ } } END { for (word in freq) { printf "%-15s %d\n", word, freq[word] } } What is the primary purpose of this AWK script?

(A) To convert contents of file to lowercase.

(B) To count the frequency of each word in a text file.

(C) To count the number of lines in a file.

(D) To replace all non-alphabetic characters in a file.

System Commands End Term: 13 April 2025 (January 2025 term)

Question 1

+7 marksOne correct option

What will be the output of the command

bash

1sort -n file1.txt file2.txt | awk '!seen[$1]++ {print $1, $2, $3}'

given the following content of file1.txt and file2.txt?

file1.txt	file2.txt
101 John Doe	102 Michael Johnson
103 Jane Smith	103 Jane Smith
105 Emma Brown	106 Lily Evans
107 William Harris	107 William Harris
109 Oliver Lewis	110 Sophia Turner

Question 2

+7 marksOne correct option

Schedule the script /home/user/backup.sh to meet the following requirements
1. The job should run at the 2nd minute of every hour, but only during weekdays (Monday to Friday).
2. Additionally, the job must not run during the first and last days of each month.
3. It should execute a script located at /home/user/backup.sh and log the output to
/var/log/backup.log (append mode).
Which of the following exact crontab entry is used to schedule this job.

Question 3

+7 marksOne correct option

awk

1#!/usr/bin/awk -f
2{
3  for (i = 1; i <= NF; i++) {
4    word = tolower($i)
5    gsub(/[^a-z]/, "", word)
6    if (word != "")
7      freq[word]++
8  }
9}
10
11END {
12  for (word in freq) {
13    printf "%-15s %d\n", word, freq[word]
14  }
15}

What is the primary purpose of this AWK script?

A
To convert contents of file to lowercase.
B
To count the frequency of each word in a text file.
C
To count the number of lines in a file.
D
To replace all non-alphabetic characters in a file.

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The IIT Madras BS System Commands (System Commands) End Term paper sat on 13 Apr 2025, in the January 2025 term: 16 questions for 100 marks in 180 minutes. The first 3 questions are below. Sign in with Google — it is free — to see the whole paper with its answers and explanations, in learning mode or as a timed mock test.

Feature	System Commands End Term 13 Apr 2025 at a glance
Term	January 2025 term
Subject	System Commands
Course code	BSSE2001
Questions	16
Marks	100
Duration	180 min
MCQ	13
MSQ	1
Numerical	2
Official paper	IIT M DIPLOMA FN EXAM QDD1 13 Apr 2025
Negative marking	No negative marking.
Updated	25 Sept 2026

System Commands End Term: 13 April 2025 (January 2025 term)

Question 1

Question 2

Question 3

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