JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY 
HYDERABAD 
II Year B.Tech. CSE - I Sem T P C 
0 3 2 
UNIX AND SHELL PROGRAMMING LAB 

Objectives: 
• To teach students various unix utilities and shell scripting 
Recommended Systems/Software Requirements: 
• Intel based desktop PC with minimum of 166 MHZ or faster processor with atleast 64 MB RAM 
and 100 MB free disk space LAN Connected 
• Any flavour of Unix / Linux 

Week1 
Session-1 
 a)Log into the system 
 b)Use vi editor to create a file called myfile.txt which contains some 
 text. 
 c)correct typing errors during creation. 
 d)Save the file 
 e)logout of the system 
 Session-2 
 a)Log into the system 
 b)open the file created in session 1 
 c)Add some text 
 d)Change some text 
 e)Delete some text 
 f)Save the Changes 
 g)Logout of the system 

Week2 
a)Log into the system 
b)Use the cat command to create a file containing the following data. Call it mytable use tabs to 
separate the fields. 
 1425 Ravi 15.65 
 4320 Ramu 26.27 
 6830 Sita 36.15 
 1450 Raju 21.86 
c)Use the cat command to display the file, mytable. 
d)Use the vi command to correct any errors in the file, mytable. 
e)Use the sort command to sort the file mytable according to the first field. Call the sorted file my table 
(same name) 
f)Print the file mytable 
g)Use the cut and paste commands to swap fields 2 and 3 of mytable. Call it my table (same name) 
h)Print the new file, mytable 
i)Logout of the system. 

Week3 
1) a)Login to the system 
b)Use the appropriate command to determine your login shell 
c)Use the /etc/passwd file to verify the result of step b. 
d)Use the who command and redirect the result to a file called myfile1. Use the more command 
to see the contents of myfile1. 
e)Use the date and who commands in sequence (in one line) such that the output of date will 
display on the screen and the output of who will be redirected to a file called myfile2. Use the 
more command to check the contents of myfile2. 
2) a)Write a sed command that deletes the first character in each line in a 
 file. 
b)Write a sed command that deletes the character before the last character in each line in a 
file. 
c)Write a sed command that swaps the first and second words in each line in a file.

Week4 
a)Pipe your /etc/passwd file to awk, and print out the home directory of each user. 
b)Develop an interactive grep script that asks for a word and a file name and then tells how many lines 
contain that word. 
c)Repeat 
d)Part using awk 

Week5 
a)Write a shell script that takes a command –line argument and reports on whether it is directory, a file, 
or something else. 
b)Write a shell script that accepts one or more file name as arguments and converts all of them to 
uppercase, provided they exist in the current directory. 
c)Write a shell script that determines the period for which a specified user is working on the system. 

Week6 
a)Write a shell script that accepts a file name starting and ending line numbers as arguments and 
displays all the lines between the given line numbers. 
b)Write a shell script that deletes all lines containing a specified word in one or more files supplied as 
arguments to it. 

Week7 
a)Write a shell script that computes the gross salary of a employee according to the following rules: 
i)If basic salary is < 1500 then HRA =10% of the basic and DA =90% of the basic. 
ii)If basic salary is >=1500 then HRA =Rs500 and DA=98% of the basic 
The basic salary is entered interactively through the key board. 
b)Write a shell script that accepts two integers as its arguments and computers the value of first number 
raised to the power of the second number. 

Week8 
a)Write an interactive file-handling shell program. Let it offer the user the choice of copying, removing, 
renaming, or linking files. Once the user has made a choice, have the program ask the user for the 
necessary information, such as the file name, new name and so on. 
b)Write shell script that takes a login name as command – line argument and reports when that person 
logs in 
c)Write a shell script which receives two file names as arguments. It should check whether the two file 
contents are same or not. If they are same then second file should be deleted. 

Week9 
a)Write a shell script that displays a list of all the files in the current directory to which the user has read, 
write and execute permissions. 
b)Develop an interactive script that ask for a word and a file name and then tells how many times that 
word occurred in the file. 
c)Write a shell script to perform the following string operations: 
 i)To extract a sub-string from a given string. 
 ii)To find the length of a given string. 

Week10 
Write a C program that takes one or more file or directory names as command line input and reports the 
following information on the file: 
 i)File type 
ii)Number of links 
 iii)Read, write and execute permissions 
 iv)Time of last access 
(Note : Use stat/fstat system calls) 

Week11 
Write C programs that simulate the following unix commands: 
a)mv 
b)cp 
(Use system calls) 

Week12 
Write a C program that simulates ls Command 
(Use system calls / directory API)

TEXT BOOKS 
1)Introduction to UNIX & SHELL programming, M.G. Venkatesh Murthy, Pearson Education. 
2)Unix concepts and applications, Fourth Edition, Sumitabha Das, TMH. 
3)Unix for programmers and users, 3rd edition, Gaham Glass & K. Ables, pearson education. 
4)Unix and shell Programming –A text book, B.A. Forouzan & R.F. Giberg, Thomson. 
5)Beginning shell scripting, E. Foster – Johnson & other, Wile Y- India.