Question

Write commands to carry out the following commands: a) Print all lines containing the string John. b) Print all lines where a word starts with J. c) Print all lines ending with word stopped. d) Print all lines that don't contain was. e) Print lines where a word begins with K or k. 2. Write a bash script that copies all files of the current directory into a new sub-directory, and then deletes the created sub-directory along with its contents and displays a message that indicates completion of the task. 3. Write a bash script that reads two numbers x and y and performs addition, subtraction, multiplication, and division of the two numbers (x y, x-y, x*y, x/y) and prints out each of these values along with some text to indicate what these numbers are.

Answer 1

Answer:

see explaination

Explanation:

1.

1. grep 'John' FileName

2. grep '^\J' FileName

3. grep 'stopped$' FileName

4. grep -v -e 'was' FileName

5. grep -E '^(k|K)' FileName

2.

#print the message to create subdirectory

echo "Creating a subdirectory to copy current directory files into named 'sub'"

#create subdirectory

mkdir sub

echo "Directory successfully created"

#Copy the files in the current working directory to created subdirectory

echo "Copying files of current directory into newly created subdirectory"

rsync -a --exclude='sub' * sub

#display the message to copy the files

echo "Copying operation completed successfully"

echo "Now deleting the created subdirectory along with its contents"

rm -rf sub

#indicated the message completion of task

echo "Operation completed successfully."

3.

#prompt and read the first number

echo "Enter the first number: "

read x

echo "Enter the second number: "

read y

#Compute arithmetic operations and store in the

#respective variable

addition=$(($x + $y))

subtraction=$(($x - $y))

multiplication=$(($x * $y))

division=$(($x / $y))

#print the values

echo "Addition of $x and $y is $addition"

echo "Subtraction of $x and $y is $subtraction"

echo "Multiplication of $x and $y is $multiplication"

echo "Division of $x and $y is $division"