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System Commands · End Term · 31 Aug 2025 (Afternoon)

20 questions · 100 marks · 90 min

Answer key Take as mock

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

System Commands

End Term · 31 Aug 2025 (Afternoon)

Official Paper

Examination Instructions & Guidelines

Solve on notebook/paper first before checking solutions.
MCQ: Exactly 1 option is correct. Negative marking applies.
MSQ: One or more options correct. Select all to score.
NAT: Numerical response. No negative marking.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

Q1MCQ5 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q2MCQ5 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q3MCQ5 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q4MCQ5 Marks·Choose one option
Key ↓
You suspect a configuration file for the package nginx was modified manually. Which command will verify this without reinstalling or removing the package?
1. A
2. B
3. C
4. D
Q5MCQ5 Marks·Choose one option
Key ↓
A file numbers.txt contains several lines of numeric strings. You want to find lines where any digit is repeated exactly twice consecutively (like "1123", "4456"). Which command works correctly?
1. A
2. B
3. C
4. D
Q6MCQ5 Marks·Choose one option
Key ↓
You're using gawk to identify repeated words in notes.txt. Which gawk statements correctly use backreferences?
1. A
2. B
3. C
4. D
Q7MCQ5 Marks·Choose one option
Key ↓
1. AOnly link target runs
2. BBoth compile and link run
3. CNothing runs since main.o exists
4. DOnly compile runs
Q8MCQ5 Marks·Choose one option
Key ↓
1. Ared and green
2. Bred and blue
3. Cgreen and yellow
4. Dred and yellow
Q9MCQ5 Marks·Choose one option
Asked 2 times Key ↓
1. A192.168.0.1 3
2. B192.168.0.2 2
3. C192.168.0.3 1
4. DBoth 192.168.0.1 3 and 192.168.0.2 2
Q10MCQ5 Marks·Choose one option
Key ↓
1. AFirst line of each paragraph
2. BAll blank lines
3. CEntire file in one line
4. DFirst field of each line
Q11MSQ5 Marks·Choose all correct options
Asked 3 times Key ↓
1. Ased -n '1,10p' file.txt
2. Bsed 11q file.txt
3. Cawk 'NR <= 10' file.txt
4. Dcat -n 10 file.txt
Q12MSQ5 Marks·Choose all correct options
Key ↓
Below is the man page of `grep`. Which of the following commands will print only the name of all .txt files that do not contain the word "error"? Assume the current directory does not have any subdirectories. Assume the filenames are alphanumeric.
1. Agrep -L "error" *.txt
2. Bgrep -v "error" *.txt
3. Cgrep -L "error" -- *.txt
4. Dfind . -name "*.txt" | xargs grep -L "error"
Q13MSQ5 Marks·Choose all correct options
Asked 2 times Key ↓
Which of the following statements about subshells is/are true?
1. A(cd /tmp; ls) runs in a subshell
2. Bcd /tmp; ls runs in a subshell
3. CVariables set in a subshell are visible to the parent shell
4. DCommands inside $(...) are executed in a subshell
Q14MSQ5 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
5. E
Q15MSQ5 Marks·Choose all correct options
Key ↓
Which of the following find commands will list all regular files in /var/log modified more than 7 days ago and larger than 5MB?
1. A
2. B
3. C
4. D
Q16NAT5 Marks·Write the number
Key ↓
Your answer:
Q17NAT5 Marks·Write the number
Asked 4 times Key ↓
Your answer:
Q18NAT5 Marks·Write the number
Key ↓
Your answer:
Q19NAT5 Marks·Write the number
Key ↓
Your answer:
Q20NAT5 Marks·Write the number
Asked 2 times Key ↓
Your answer:

Official Key

Master Answer Key & Explanations

Official answer keys from IIT Madras BS past papers. Click any question to review.

Reveal Key

Q1C

Q2C

Q3D

Q4C

Q5A

Q6B

Q7B

Q8B

Q9A

Q10A

Q11A, B, C

Q12A, C, D

Q13A, D

Q14A, B, D

Q15A, B, C

Q161

Q17120

Q189

Q192

Q2025

Questions and answer keys are reproduced from the official IIT Madras BS papers. BTechi is not affiliated with IIT Madras.