I normally use ksh instead of bash (and it has had associative arrays since 1993). In Bash, there are two types of arrays. 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. Remove duplicate array elements. There are the associative arrays and integer-indexed arrays. The syntax of delete statement is as follows − Syntax delete array_name[index] The following example deletes the element orange. So "if condition then incremement counter, else remove item at current position" Last edited by Trilby (2012-09-06 11:51:32) When you remove one from the array, you should decrement the counter. Alternately, only increment the counter in the conditional code for when you dont remove and item. The unset function is used to destroy any other variable and same way use to delete any element of an array. These index numbers are always integer numbers which start at 0. This allows us to effectively remove array duplicates. Dictionary / associative arrays / hash map are very useful data structures and they can be created in bash. I have no idea why you have two counters. An associative array lets you create lists of key and value pairs, instead of just numbered values. There is no maximum limit on the size of an array, nor any requirement that members be indexed or assigned contiguously. When setting associative array values and a duplicate assignment occurs, bash overwrites the key. Similarly, we can use delete statement to remove an element from the array. I even checked older bash and it's still wrong there; like you say set -x shows how it expands. You can assign values to arbitrary keys: $ 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. Example Function: Let's see an example: 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. Bash, however, includes the ability to create associative arrays, and it treats these arrays the same as any other array. Deleting Array Elements. Create a temporary associative array. dictionaries were added in bash version 4.0 and above. Introduction to bash arrays and bash array operations. Arrays in Bash. array=${array[@]:1} #removed the 1st … To access array elements, we use array_name[index] format. 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 provides one-dimensional indexed and associative array variables. Bash Associative Arrays by Mitch Frazier. 6.7 Arrays. Unfortunately, bash and ksh declare associative arrays We will go over a few examples. CAVEAT: Requires bash 4+ CAVEAT: List order may not stay the same. 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). 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. For insertion, we used assignment operator. I guess I didn't test that comment before posting. They work quite similar as in python (and other languages, of course with fewer features :)). To check the version of bash run following:

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