Unix Questions and Answers
The Unix operating system is a powerful, multitasking platform widely used in computing environments. Knowledge of Unix commands, file handling, and process management is vital for students and professionals preparing for programming questions and answers in technical interviews and campus placements at TCS, IBM, and Tech Mahindra. This guide includes Unix MCQs and problem-solving examples that focus on shell scripting, permissions, and file system hierarchy. Practicing these questions improves command-line fluency and builds the foundation for advanced OS and system administration roles.
Unix
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49 questions
1. Which symbol will be used with grep command to match the pattern pat at the beginning of a line?
- ^pat
- $pat
- pat$
- pat^
2. Which command is used to sort the lines of data in a file in reverse order
- sort
- sh
- st
- sort -r
4. Which command is used to copy all files having the string chap and any two characters after that to the progs directory?
- cp chap?? progs
- cp chap* progs
- cp chap[12] /progs/*.*
- cp chap?? /progs/*
5. Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?
- chmod u+x emp[l-3]
- chmod 777 emp*
- chmod u+r ??? emp
- chmod 222 emp?
7. Which of the following keys is used to replace a single character with new text?
- S
- s
- r
- C
8. Which command is used to extract specific columns from the file?
- cat
- cut
- grep
- paste
9. Which command sends the word count of the file infile to the newfile.
- wc infile >newfile
- wc <infile >newfile
- wc infile - newfile
- wc infile | newfile
10. Which command is used to remove the read permission of the file 'note' from both the group and others?
- chmod go+r note
- chmod go+rw note
- chmod go-x note
- chmod go-r, 4-x note