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Introduction to bash arrays and bash array operations. The syntax of delete statement is as follows â Syntax delete array_name[index] The following example deletes the element orange. I avoided associative arrays in my suggestion, because I only have access to bash version 3.2.57(1)-release (x86_64-apple-darwin16) and it doesn't have associative arrays. 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). There are the associative arrays and integer-indexed arrays. I normally use ksh instead of bash (and it has had associative arrays since 1993). There is no maximum limit on the size of an array, nor any requirement that members be indexed or assigned contiguously. unset array[0] removes the element but still if I do echo ${array[0]} I get a null value moreover there are other ways of doing this but if an element of an array contains spaces like below array[0]='james young' array[1]='mary' array[2]='randy orton' but these also fail to do the job. This allows us to effectively remove array duplicates. For insertion, we used assignment operator. CAVEAT: Requires bash 4+ CAVEAT: List order may not stay the same. I have no idea why you have two counters. In Bash, there are two types of arrays. Create a temporary associative array. Any variable may be used as an indexed array; the declare builtin will explicitly declare an array. Remove duplicate array elements. You can assign values to arbitrary keys: $ An associative array lets you create lists of key and value pairs, instead of just numbered values. Deleting an element from the array To delete an element from the array we need to know it's index or its key in the case of an associative array, and use the unset command. Bash, however, includes the ability to create associative arrays, and it treats these arrays the same as any other array. When you remove one from the array, you should decrement the counter. These index numbers are always integer numbers which start at 0. on April 28, 2010. dictionaries were added in bash version 4.0 and above. It only works with a 1-element array of an empty string, not 2 elements. Example Function: We will go over a few examples. Let's see an example: Arrays in Bash. 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. It should iterate over each defined name and run the command. Using unset() Function: The unset() function is used to remove element from the array. Bash Associative Arrays by Mitch Frazier. Alternately, only increment the counter in the conditional code for when you dont remove and item. They work quite similar as in python (and other languages, of course with fewer features :)). So "if condition then incremement counter, else remove item at current position" Last edited by Trilby (2012-09-06 11:51:32) To check the version of bash run following: Dictionary / associative arrays / hash map are very useful data structures and they can be created in bash. When setting associative array values and a duplicate assignment occurs, bash overwrites the key. array=${array[@]:1} #removed the 1st ⦠Unfortunately, bash and ksh declare associative arrays I guess I didn't test that comment before posting. Bash provides one-dimensional indexed and associative array variables. To access array elements, we use array_name[index] format. Elements in arrays are frequently referred to by their index number, which is the position in which they reside in the array. 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