Bash Scripting at a glance - Learn Bash scripting

name="Akash"
echo "Welcome $name"

Welcome Akash

#Simple If else in Bash

echo "Please Enter your age : "
read age

if [ $age < 10 ]; 
    then echo "You are really small.."
else
    echo "You are growing.."
fi

# Printing 1 to 100 using for loop

for((i=1;i<=100;i++))
do
    echo $i
done

for i in `seq 1 100`
do
    echo $i
done

# Printing 1 to 100 even numbers using for loop
for((i=0;i<=100;i=i+2))
do
    echo $i
done

# Printing 1 to 100 odd numbers using for loop
for((i=1;i<=100;i=i+2))
do
    echo $i
done

# Multiplication Program 1 to 10 in Bash

for((i=1;i<=10;i++))
do
    for((j=1;j<=10;j++))
    do
        echo $i "X" $j "=" $(($i*$j))
    done
    echo
done

echo "Please Enter your File Name : "
read file_name

if [ -f $file_name ];
    then  clear
    rm $file_name
    echo "File $file_name is deleted successfully"
    
else
    clear
    touch $file_name
    echo "No file found for your search $file_name"
fi

echo "All files are Now : "
ls

1. Read the file_name in  read file
2. Check if file exist in if clause if [ -f $file_name ]; 
3. If Exist then remove the file using rm $file_name. 
4. If file is not found, create a new file as that name using touch $file_name 
5. Finally, show the file lists, using ls.

echo "How many numbers do you want to add in the array : "
read num

#Take value in the array and put it in a sum variable
arr=()  #Empty Array
sum=0

for ((i=0;i<num;i++));
do
    echo "Array[$i] = "
    read arr[$i]
    sum = $((sum+arr[$i]))
done

echo "Summation Is : $sum"

##
#   Delete a value from array
##

echo "Please enter a value to delete from the array = "
read delete_value;

for ((i=0;i<num;i++));
do
    if [ $((arr[$i])) = $delete_value ]; then 
        unset arr[$i]   #Delete using unset
    fi
done


#Show final array
echo  "Array is = ${arr[@]}"

n=123456
rev=0

while [ $n -gt 0 ]
do
    reminder=$(( $n % 10 ))
    rev=$(( rev*10 + reminder  ))
    n=$(( $n / 10 ))
done

echo $rev

n=123456
echo $n | rev

num=1289
i=2

while [ $i -lt $num ]
do
  if [ $(( num%i )) = 0 ];
  then
      echo "$num is not a prime number"
      echo "It is divisible by $i"
      exit
  fi
  $i=$(( i+1 ))
done

echo "$num is a prime number "