unix

 1.Arithmatic opration using swith case in UNIX

#!/bin/bash

echo "Enter first number: "

read num1

echo "Enter second number: "

read num2

echo "Enter the operation (+, -, '*', '/'): "  # Enclose '*' and '/' in single quotes

read operation

case $operation in

    +) result=$((num1 + num2));;

    -) result=$((num1 - num2));;

    '*') result=$((num1 * num2));;   # Use single quotes to specify '*'

    '/') result=$((num1 / num2));;   # Use single quotes to specify '/'

    *) echo "Invalid operation"; exit 1;;

esac

echo "Result: $result"

2.print Febonacci series or prime number

#!/bin/bash

echo "Enter 'F' for Fibonacci series or 'P' for prime numbers: "

read choice

if [ "$choice" = "F" ]; then

    echo "Enter the number of terms in Fibonacci series: "

    read n

    a=0

    b=1

    echo "Fibonacci Series: "

    for ((i=0; i<n; i++)); do

        echo -n "$a "

        temp=$((a + b))

        a=$b

        b=$temp

    done

    echo

elif [ "$choice" = "P" ]; then

    echo "Enter the range for prime numbers: "

    read range

    echo "Prime Numbers: "

    for ((num=2; num<=range; num++)); do

        is_prime=1

        for ((i=2; i<=num/2; i++)); do

            if [ $((num % i)) -eq 0 ]; then

                is_prime=0

                break

            fi

        done

        if [ $is_prime -eq 1 ]; then

            echo -n "$num "

        fi

    done

    echo

else

    echo "Invalid choice"

    exit 1

fi

3.Input string vowels , constents , special chrecter , digits , spaces , symbol

#!/bin/bash

echo "Enter a string: "

read input_string

vowels=$(echo $input_string | tr -cd 'AEIOUaeiou' | wc -c)

consonants=$(echo $input_string | tr -cd 'BCDFGHJKLMNPQRSTVWXYZbcdfghjklmnpqrstvwxyz' | wc -c)

digits=$(echo $input_string | tr -cd '0-9' | wc -c)

spaces=$(echo $input_string | tr -cd ' ' | wc -c)

symbols=$(echo $input_string | tr -cd '!@#$%^&*()_+' | wc -c)

echo "Vowels: $vowels"

echo "Consonants: $consonants"

echo "Digits: $digits"

echo "Spaces: $spaces"

echo "Symbols: $symbols"

4.input file name count the lines word and chrecters 

#!/bin/bash

echo "Enter the filename: "

read filename

if [ -f "$filename" ]; then

    lines=$(wc -l < "$filename")

    words=$(wc -w < "$filename")

    characters=$(wc -m < "$filename")

    echo "Lines: $lines"

    echo "Words: $words"

    echo "Characters: $characters"

else

    echo "File not found"

fi

5.check 2 file and if its same containt then delete any on

#!/bin/bash

echo "Enter the path to the first file: "

read file1

echo "Enter the path to the second file: "

read file2

if cmp -s "$file1" "$file2"; then

    echo "The files have the same content."

    echo "Do you want to delete one of them? (y/n): "

    read choice

    if [ "$choice" = "y" ]; then

        echo "Which file do you want to delete? Enter '1' or '2': "

        read file_to_delete

        if [ "$file_to_delete" = "1" ]; then

            rm "$file1"

            echo "File 1 deleted."

        elif [ "$file_to_delete" = "2" ]; then

            rm "$file2"

            echo "File 2 deleted."

        else

            echo "Invalid choice. No files were deleted."

        fi

    else

        echo "No files were deleted."

    fi

else

    echo "The files have different content. They are not deleted."

fi

6.find even or odd numberand addition of that number

#!/bin/bash

echo "Enter the starting number: "

read start

echo "Enter the ending number: "

read end

even_sum=0

odd_sum=0

for ((num=start; num<=end; num++)); do

    if [ $((num % 2)) -eq 0 ]; then

        echo "$num is even."

        even_sum=$((even_sum + num))

    else

        echo "$num is odd."

        odd_sum=$((odd_sum + num))

    fi

done

echo "Sum of even numbers: $even_sum"

echo "Sum of odd numbers: $odd_sum"

7.reverse string or number check pelindrom

#!/bin/bash

echo "Enter a string or number: "

read input

# Function to reverse a string

reverse_string() {

    local input="$1"

    local reversed=""

    local len=${#input}

    for ((i = len - 1; i >= 0; i--)); do

        reversed="${reversed}${input:i:1}"

    done

    echo "$reversed"

}

# Check if the input is a palindrome

is_palindrome() {

    local original="$1"

    local reversed="$2"

    if [ "$original" = "$reversed" ]; then

        echo "Palindrome: Yes"

    else

        echo "Palindrome: No"

    fi

}

# Remove non-alphanumeric characters and convert to lowercase

input_cleaned=$(echo "$input" | tr -d -c '[:alnum:]' | tr '[:upper:]' '[:lower:]')

reversed_input=$(reverse_string "$input_cleaned")

echo "Reversed: $reversed_input"

is_palindrome "$input_cleaned" "$reversed_input"

8.enter directory and check sub folder , empty file permisson of file

#!/bin/bash

echo "Enter the directory path: "

read directory

if [ -d "$directory" ]; then

    # List subdirectories

    echo "Subdirectories in $directory:"

    for subdirectory in "$directory"/*; do

        if [ -d "$subdirectory" ]; then

            echo "$subdirectory"

        fi

    done

    # Check and display empty files and their permissions

    echo "Empty files and their permissions in $directory:"

    for file in "$directory"/*; do

        if [ -f "$file" ]; then

            if [ ! -s "$file" ]; then

                echo "Empty file: $file"

                permissions=$(stat -c "%a" "$file")

                echo "Permissions: $permissions"

            fi

        fi

    done

else

    echo "$directory is not a valid directory."

fi