CS701 : Software Practice and Experience Laboratory 2004-2005

Quiz 3

Topic : Shell Programming
Date : October 26, 2004,  2:00pm to 4:00pm.

Some Reference Manual Links

General Instructions

  1. Sit only at the place assigned to you. Do not access any other system.
  2. You can use internet, shell-programming documentation, tutorials and your own assignment code.
  3. Accessing email, messages  or any other personal communication (including phones) are not allowed during examination hours.
  4. Sharing files is strictly prohibited.
  5. There will be no extension of time. The upload form will be closed at 4:00pm.
  6. There will be PENALTY for late and incorrect submissions.
  7. Quiz evaluation will be from 4:15pm-5:30pm.
NOTE : If no argument is provided then script should print the usage.

Question 1                                                                                                                                    6 Marks
Write a script "random <filename>" to select a random line from given text file.
Hint : expr $RANDOM % 10 prints random number between 0 and 9.
Sample input file

Question 2                                                                                                                     12 Marks
PATH variable contains number of ":" separated directories.
Write a script for following without using 'find' command.
a) "list -e <extension>" which prints all files having given extension in directories of PATH variable.
b) "list -s <size>" which prints all filenames in directories of PATH variable with size greater than input size.

In both the options, you need to print absolute path.
You don't have to handle both options at same time.

Hint: Parse the PATH and do it for each directory.
Following commands create a bin directory in home directory and adds some files in it.
mkdir -p ~/bin
PATH=$PATH:~/bin
touch  ~/bin/yogesh.java  ~/bin/sandeep.ksh ~/bin/sachin.sh ~/bin/tarun.java ~/bin/babu.tex ~/bin/vats.pl

Question 3                                                                                                                     12 Marks          
File Records.txt contains the set of entries in following format :

TITLE: XXXXXXXXXXXXXXXXXXXXX
<Multi line description>
<single line summary>

Each Title can be assumed to be unique.
Two entries are separated by a blank line.

Write the following scripts without using 'awk' command.
a. "getEntry <n:Entry number> <filename>" which prints the nth entry in the file.
b. "getSummary <Title> <filename>" which prints the summary for the given title.
     Note: Title being a string needs to be enclosed in double quotes.

Hint: for ((I=0;I<10;I++)); do echo "Lopping $I"; done  prints numbers from 0 to 9.

Submission Guidelines