I've declared match in my main function and I need to use this in another function which looks like this: Adding array elements in bash. You could use the same technique for copying associative arrays: In this article, we will explain how you can declare and initialize associative arrays in Linux bash. It's not like bash internally creates a row for 0 with columns labelled 1 and 0. I'm trying to replicate this function I've written in Python that prints a message based on the player and opponents move and compares those moves with an associative array called match. In other words, associative arrays allow you to look up a value from a table based upon its corresponding string label. However, you may use name references to pass names of associative arrays (or of whatever other variable you may want). If you agree with that, then you probably won't want to read about the "new" associative arrays that were added in version 4.0 of bash. For example, you can append Kali to the distros array as follows: 1. Enter the weird, wondrous world of Bash arrays. You can use the += operator to add (append) an element to the end of the array. on April 28, 2010. Example: We will further elaborate on the power of the associative arrays with the help of various examples. There is another solution which I used to pass variables to functions. Associative arrays (sometimes known as a "hash" or "dict") use arbitrary nonempty strings as keys. What specifically is your concern about the script being "easily modified" here? Bash associative array in function. Bash Associative Arrays by Mitch Frazier. Copying associative arrays is not directly possible in bash. Data structures other than strings can't really be passed around between shell functions. The best solution probably is, as already been pointed out, to iterate through the array and copy it step by step. Bash supports both regular arrays that use integers as the array index, and associative arrays, which use a string as the array index. You just need to add two lines for each function addition, so I'd call that easily modified. Let’s create an array that contains name of the popular Linux distributions: distros=("Ubuntu" "Red Hat" "Fedora") The distros array current contains three elements. arrays bash associative-array Bash, however, includes the ability to create associative arrays, and it treats these arrays the same as any other array. My problem is when ${USER_PARAMETERS_KEYS[j]} becomes equal to dstIPField since it has an empty string value in the associative array, so the if condition is not satisfied although the key is there. Bash return an associative array from a function and then pass that associative array to other functionsHelpful? Associative arrays are an abstract data type similar to dictionaries or maps. Associative arrays are always unordered, they merely associate key-value pairs. How to pass an associative array as argument to a function in Bash , I had exactly the same problem last week and thought about it for quite a while. Name references are available in bash since release 4.3. The first thing we'll do is define an array containing the values of the --threads parameter that If you're using Bash 4.3 or newer, the cleanest way is to pass the associative array by name and then access it inside your function using a name reference with local -n. The bash man page has long had the following bug listed: "It's too big and too slow" (at the very bottom of the man page). 0,1 doesn't mean anything special in associative arrays, that's just the string 0,1. It seems, that associative arrays can't be serialized or copied. How can I pass a key array to a function in bash? 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