OS Lab Assignment Complete Solution

OS LAB ASSIGNMENT COMPLETE SOLUTION

GLA University, Mathura
Course: B. Tech (CSE/ IBM related courses) UNIX OS Lab/BCSC 0804
Session: 2020-21

• COMMAND IMPLEMENTATION ON SHELL

1. Implement the following basic commands used in LINUX/ UNIX OS ( Also perform all the commands with their switches as assignment)

ls  - List All Files Present In Current Directory

man - Online Manual(Help) About Command

pwd -  Prints Current Working Directory

who - Lists who is logged on system.

whoami - Lists the Username of the current user logged in

date - Print out Current Date

cal - Print Calender

mkdir - Make a directory

rm - Remove or delete file

rmdir - Remove Directory

cat - Opens an existing file

head - Display first 10 lines of the file

tail - Dispaly last 10 files of the file

more - Look at file

less - Allow Backward movement in the file.

cp - Copy file into directory

mv- Move File

echo - Display the Value

2. a. Implement the following basic commands used in LINUX/ UNIX OS ( Also perform all the commands with their switches)

cut - Display Only the columns from file

uniq - Filter out the repeated lines in file.

chmod - Change file permissions

du - list the disk usage of the given file.

diff - Check two files are same or not.

history - Lists command You've done recently

last - Find out who has recently log in or out

sort - sorts the content in a file

sed - use to replace text in a file.

grep - find which lines in a file.

pipe - redirect standard output,input or error of one process to another.

b. Implement the special shell scripting variables such as $$,$0,$1,$*,$@,$# etc

SHELL PROGRAMMING

3. Shell scripts that uses simple commands: 

a. Write a shell script to display current date in a particular format, number of users currently login and current month’s calendar

b. Write a shell script to display the process name and its process id.

c. Write a shell script to take name as a input and display a greeting message to the user by checking system clock. (Ex :- Hello John Good Morning in morning time else Hello John Good Afternoon in afternoon time else Hello John Good Evening in Evening time)

d. Write a shell script to merge the content of 2 files into one file.

4. Decision based Shell scripts:

a. Write a shell script that finds whether an entered number is even or odd.

b. Write a shell script to input the name of a file as command line argument and display

whether it is a file, a directory or anything else.

c. Write a shell script to input the marks of a student in 3 subjects and find his grade

d. Write a Shell script to accept a filename as argument and displays the last

modification time if the file exists and a suitable message if it doesn't.

e. Write the shell script to take file name as input and if the file exists then print the

number of lines and also print 10th line of that file.

5. Shell scripts related to loops and arrays

a. Write a shell script that print multiplication table of a given no

b. Write a shell script to implement a timer.

c. Write a shell script that print reverse of a given positive number.

d. Write a shell script that print factorial of a given number.

e. Write a shell to demonstrate the working of array. Input 10 integer in array and

display maximum, minimum, total sum and average of an array.

f. You are given a file with four space separated columns containing the scores of

students in three subjects. The first column contains a single character (A-Z), the

student identifier. The next three columns have three numbers each. The numbers

are between 0 and 100, both inclusive. These numbers denote the scores of the

students in English, Mathematics, and Science, respectively. Your task is to identify

whether each of the students has passed or failed.

A student is considered to have passed if (s) he has a score 50 or more in each of

the three subjects.

6. Shell scripts related to strings and pipes:

a. Write a shell script to input two strings from the user and determine whether they are

same or not.

b. Write a shell script to input a string from the user and determine its length.

c. Write a shell script to input two strings from the user and find the occurrences of

string2 in string 1.

d. Write a shell script to input the name of a file as command line argument and display

the number of characters, words and lines in the file.

e. Write a shell script to display a list of directories within the current directory and how

much space they consume, sorted from the largest to the smallest.

f. Write a short script count txt to count the total number of .txt files in the current

directory, and print out this number to screen.

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