Question

1.Write a shell script function called reversal that displays the reverse of a given string.

2.Write a shell script function that changes a given string to all CAPS.

Answer 1

Answer 1): HomeworkLib.sh (filename)

#!/bin/bash
reversal()
{
#read the input from commandline and store in input variable
read -p "Please enter the input string:" input
#finding the length of input string and store in len_of_string
len_of_string=${#input}
#run a for loop for entire length and print each character from last to first and append in output string variable each time
for (( i=$len_of_string-1; i>=0; i-- ))
do
output="$output${input:$i:1}"
done
#print the output
echo "Reverse of given input string is : $output"
}

#script starts here
#calling the reversal function
reversal

OUTPUT:

[root@njangid ~]# ./HomeworkLib.sh
Please enter the input string:Nicklodean
Reverse of given input string is : naedolkciN

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Solution 2):

#!/bin/bash
ConvertToUpperCase()
{
#read the input from commandline and store in input variable
read -p "Please enter the input string : " input
echo "After converting in into Capital letters given input string is : "
echo $input | tr '[a-z]' '[A-Z]'
}
#script starts here
#calling the function
ConvertToUpperCase

OUTPUT: HomeworkLib.sh(filename)

[root@Navin ~]# ./HomeworkLib.sh
Please enter the input string:Hello
After converting in into Capital letters given input string is :
HELLO