Linux/Unix Shell Scripting Basics

Question 1 Multiple Choice (Single Answer)

You are executing the following commands in a shell $ cp ~/myfile.dat /media/mounted/ext/drive1/newmyfile.dat $ cd /media/mounted/ext/drive1 $ mv newmyfile.dat oldmyfile.dat and now you are asked to display the long listing of the file "newmyfile.dat". Which of the following will you use ?

ls -lrt !cp:2
ls -lrt !mv:1
ls -lrt /media/mounted/ext/drive1/newmyfile.dat
a and b will give "Command not found error" and c will work fine and all other options are incorrect.
a,b and c will give correct results.

Question 2 Multiple Choice (Single Answer)

You are done using your external memory disk (say-KINSTON Pen disk) in Linux and you want to unmount it. But you get an error message like "umount: /media/KINGSTON: device is busy". Which of the following you can use to UNMOUNT IT SAFELY.

Find the process that is using the drive and kill it safely.
option a is correct and the following needs to be done to implement it: fuser /media/KINGSTON;fuser -k /media/KINGSTON; umount /media/KINGSTON
Option a is incorrect and unsafe and you need to hard boot to solve this problem.
Use a force option on unmount to acheive this : umount -F /media/KINSGTON
a and b are correct.

Question 3 Multiple Choice (Single Answer)

You have purchased a dual processor quad-core server and you run the command "cat /proc/cpuinfo | grep processor | wc -l " what will be the output:

2
16
8
a and b are incorrect. C is correct.
a or c. result depends on other configuration of the system.

Question 4 Multiple Choice (Single Answer)

You have 5 mp3 files in a directory and you are planning to rename the all .mp3 files to .ogg files. Will the following Shell script acheive your goal ? for i in ls *.mp3; do mv $i $i.ogg done. Will the above script rename correctly and how many number of files will be present in the directory after execution of the script ?

Yes. 0 files will be present
No
Yes. 5 file or more will be present.
Yes. Only 5 files will be present.
All the above are incorrect.

Question 5 Multiple Choice (Single Answer)

You have 5 mp3 files in a directory and you are planning to rename the all .mp3 files to .ogg files. Will the following Shell script acheive your goal ? for i in ls *.mp3; do mv $i $i.ogg done. Will the above script rename correctly and how many number of files will be present in the directory after execution of the script ?

Yes. 0 files will be present
No
Yes. 5 file or more will be present.
Yes. Only 5 files will be present.
All the above are incorrect.

Question 6 Multiple Choice (Multiple Answers)

For debugging shell Scripts which command is used?

set filename
set -x
set +x
set ls -l

Question 7 Multiple Choice (Multiple Answers)

what are the system variables in unix?

PATH variable
HOME variable
IFS variable
All the above

Question 8 Multiple Choice (Multiple Answers)

which commans are used to manipulate the ownership of file or directory?

chown
chgrp
both 1 & 2
None of the above

Linux/Unix Shell Scripting Basics

Questions