Bash Arrays

In Bash, an array is a variable that can hold multiple values. It allows you to store and access a collection of elements using a single variable name. Here’s how you can work with arrays in Bash:

  1. Array Declaration: You can declare an array by assigning values to it using parentheses and separating the elements with spaces. For example:
my_array=("apple" "banana" "cherry")

2. Accessing Array Elements: To access individual elements of an array, you use the syntax ${array_name[index]}. The index starts from 0 for the first element. For example:

echo ${my_array[0]}  # Output: apple
echo ${my_array[1]}  # Output: banana

3. Array Length: You can get the length of an array using the ${#array_name[@]} syntax. For example:

echo "Array length: ${#my_array[@]}"  # Output: Array length: 3

4. Modifying Array Elements: You can modify individual elements of an array by assigning a new value to the desired index. For example:

echo ${my_array[2]}  # Output: strawberry

5. Iterating Over an Array:

You can iterate over all elements of an array using a loop. For example:

for element in "${my_array[@]}"; do
  echo $element

6. Appending Elements to an Array: You can append elements to an array using the += operator. For example:

my_array+=("grape" "melon")

7. Removing Elements from an Array: To remove elements from an array, you can use the unset command with the index of the element you want to remove. For example:

unset my_array[1]

These are some basic operations you can perform with Bash arrays. Arrays provide a convenient way to work with collections of data and enable you to store, retrieve, modify, and iterate over multiple values using a single variable.

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