Bash does not support multi-dimensional arrays, but there is a way to imitate this functionality, if you absolutely have to. Getting the array length. If your interactive shell is bash, you can look at the structure of the array you've created using declare -p messages to see if the problem you're experiencing is in the assignment or the display of the array contents. You can use associative arrays if your bash is recent enough: unset assoc declare -A assoc assoc["1.2.3"]=x But, I'd rather switch to a language that supports multidimensional arrays (e.g. There is no maximum limit on the size of an array, nor any requirement that members be indexed or assigned contiguously. We will further elaborate on the power of the associative arrays with the help of various examples. As a quick example, here’s a data table representing a two-dimensional array. You can traverse through the array elements and print it, using looping statements in bash. Bash Array Modification Example. Execute the shell script, and the variable is successfully converted into array and the strings can be iterated separately # /tmp/split-string.sh My array: string1 string2 string3 Number of elements in the array: 3 Method 4: Bash split string into array using tr There are the associative arrays and integer-indexed arrays. Arrays in Bash. echo "${array[@]}" Print all elements as a single quoted string The Bash provides one-dimensional array variables. In this article, we will explain how you can declare and initialize associative arrays in Linux bash. Perl). Here is an example: To get the length of an array, we can use the {#array[@]} syntax in bash. In your favourite editor type #!/bin/bash And save it somewhere as arrays… Example-3: Reading Array values using for loop: You can easily count the total number of elements of any bash array by using “#” and “*” symbol which is shown in the first part of the following example.For loop is commonly used to iterate the values of any array. If the index number is @ or *, all members of an array are referenced. Arrays are indexed using integers and are zero-based. bash documentation: Accessing Array Elements. Append. Initialize or update a particular element in the array. array[10]="elevenths element" # because it's starting with 0 3.1. Change Index. You can also read array values and array indexes separately by using for loops. 3. Pre-requistites Knowing how to declare an array and set its elements Knowing how to get the indices of an array Knowing how to cycle through an array Setup This is the same setup as the previous post Let’s make a shell script. These index numbers are always integer numbers which start at 0. Method 3. These chained printf are used to forge a single parameter that will be safe if some array elements contain space chars. Also try putting that command into your script to see what happens. The length of an array means, the total number of elements present in the given array. 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