Question

lab software

using

cygwin

part1

part2

1 of 1 1. Write a shell program name it "lab4q1.sh" to compare the two strings: a. Read the first string. b. Read the second string. c. If the strings are empty print "String Empty" and exit using the statement exit 1. d. Compare the two strings using the if and print longer string. e. If the size of both strings is same, then print that two strings are equal (use printf), otherwise, print two strings are not equal (use printf), and exit with exit 0. Write a shell program lab3.sh that will take 5 times input number from the user. After each input taken, you need to calculate sum and the average of the inputs number and display them. If the user enters -1, you need to quit the program. Ex: After 5 Numbers entered: Enter a number: 10 Total: 10 Average: 10 Enter a number: 15 Total: 25 Average: 12 Enter a number: 20 Total: 45 Average: 15 Enter a number: 25 Total: 70 Average: 17 Enter a number: 30 Total: 100 Average: 20 After -1 is ente red: Enter a number: 10 Total: 10 Average: 10 Enter a number: 20 Total: 30 Average: 15 Enter a number: 30 Total: 60 Average: 20 number: -1 Enter a Bye!

Answer 1

Part 1 Answer:

read string_1 #reading first of string

read string_2 #reading second string

if [ -z "$string_1" ] && [ -z "$string_2" ] #checking whether strings are empty or not

then

printf "String Empty\n"

exit 1 # exiting with 1 if stringa s are empty

fi

if [ ${#string_1} -ge ${#string_2} ] #checking the equality of string

then

if [ ${#string_1} -eq ${#string_2} ] # checking two string are equal or not

then

printf "Two Strings are equal\n"

exit 0

fi

printf $string_1

printf "\nStrings are not equal"

exit 0

else

printf $string_2

printf "\nStrings are not equal"

exit 0

fi

Part 2 Answer:

total=0 # variable for total value

average=0 # variable for average value

for (( num=1; num<=5;num++ )); # for loop

do

printf "Enter a number: "

read number

if [ $number == -1 ] # checking the user input

then

printf "Bye !\n"

exit 0

fi

(( total += number )) # calculation the total value

(( average = total/num ))

printf "Total: %d\n" $total

printf "Average: %d\n\n" $average

done