UNIX Assignments: Day 1

Concept: Basic commands in UNIX,

Objective: At the end of the assignment, participants will be able to: • Execute Basic Unix commands Problems:

Section 1:

1. List all the files and sub directories of the directory /bin.

ls –l /usr/bin

2. List all the files including hidden files in your current directory.

ls -l -a

3. List all the files starting with letter ‘r’ in your current

directory.

ls r*

4. List all the files having three characters in their names, from your

current directory.

ls | grep '^...$'

5. List all the files with extension .doc in your current directory.

ls | grep '.doc$'

6. List all the files having the first letter of their name within the

range ‘l’ to‘s’, from your current directory.

ls | grep '^[l-s]'

7. Create a file text1 and read its input from keyboard.

grep "" > text1

8. Copy the contents of file text1 to another file text2.

mv text1 text2

9. Append the contents of file text2 to file text1.

cat text1 >> text2

10. Count the number of files in the current directory.

ls | wc -l

11. Display the output of command ls –l to a file and on the output

screen.

ls -l | tee text1

12. From file text1 print all lines starting from 10th line.

head --lines=10 text1

13. Find the number of users currently logged on to the system.

cat /etc/passwd | wc -l

14. Delete all the files with their names starting with “tmp”.

rm -v tmp*

15. List only the directories in your current directory

ls -d */ ls -l | grep "^d"

1. Count the total number of words in file text1.

2. Display the system date in following format: Today is Friday, 17 May

96

echo "Today is $(date)"

3. Display the following text message on the monitor screen. Deposited

$100 to you account

echo "Deposited $100 to your account"

4. Display the following message on the monitor. The long listing of my

home dir ………… is ………… (Hint: Use ls – l and pwd commands)

echo "The long listing of my home dir $HOME is $(pwd)"

5. Display the name and count of the directories in the current

directory.

echo -e "$(ls -d */)\nTotal number of Directories: $(ls -d *. | wc -w)"

6. Assign a value “Black” to var1 and then display the following

message on the terminal using this variable. Black belt is associated with

karate

7. Create the file employee.txt having colon (: ) separated fields. The fields of the record are: enumber, ename, eposition, esal, edoj, edept. And now answer the following:

a. List all the employees along with a row number

b. Sort the file as per the names

cut -d ':' -f 2 emp.txt | sort

c. List top three salaried employees

cut -d ':' -f 4 emp.txt : sort : tail -n 3

d. Remove duplicate records from the file

e. List dept. no along with no. of employees working in each dept. f. Sort the file in descending order of salary