Array Basics Shell Scripting | Set 2 (Using Loops)

# !/bin/bash
# To declare static Array 
arr=(1 12 31 4 5)
i=0

# Loop upto size of array
# starting from index, i=0
while [ $i -lt ${#arr[@]} ]
do
    # To print index, ith
    # element
    echo ${arr[$i]}
    
    # Increment the i = i + 1
    i=`expr $i + 1`
done

# !/bin/bash
# To declare static Array 
arr=(1 2 3 4 5)

# loops iterate through a 
# set of values until the
# list (arr) is exhausted
for i in "${arr[@]}"
do
    # access each element 
    # as $i
    echo $i
done

# !/bin/bash
# To input array at run
# time by using while-loop

# echo -n is used to print
# message without new line
echo -n "Enter the Total numbers :"
read n
echo "Enter numbers :"
i=0

# Read upto the size of 
# given array starting from
# index, i=0
while [ $i -lt $n ]
do
    # To input from user
    read a[$i]

    # Increment the i = i + 1
    i=`expr $i + 1`
done

# To print array values 
# starting from index, i=0
echo "Output :"
i=0

while [ $i -lt $n ]
do
    echo ${a[$i]}

    # To increment index
    # by 1, i=i+1 
    i=`expr $i + 1`
done

# !/bin/bash
# To input array at run 
# time by using for-loop

echo -n "Enter the Total numbers :"
read n
echo "Enter numbers:"
i=0

# Read upto the size of 
# given array starting 
# from index, i=0
while [ $i -lt $n ]
do
    # To input from user
    read a[$i]

    # To increment index 
    # by 1, i=i+1
    i=`expr $i + 1`
done

# Print the array starting
# from index, i=0
echo "Output :"

for i in "${a[@]}"
do
    # access each element as $i
    echo $i 
done