![]() Remember that this method appends to the end of an array. For example, the process for an indexed array would look like this: IndexedArray=(car plane bike) Keep in mind that the key must be a string: AssociativeArray=blueĪn alternative way would be: declare -A AssociativeArray=( =blue =car =200 ) How to Add a Variable to a Bash ArrayĮasily add bash variables using the += operator. While indexed arrays don’t require the declare builtin, it won’t be possible to create an associative bash array without declaring it first: declare -A AssociativeArray For example, you can declare only the first and third elements while leaving the second element of an array empty: IndexedArray=car However, there is an option to set an array with indices: IndexedArray=(=’car’ =’plane’ =’bike’)Īn interesting feature of bash arrays is that following index numbers in order is not necessary. Remember that indexing starts at 0, so the above example will assign the car element of the array to the 0 index. Or, make it even simpler by going with: IndexedArray=(car plane bike) The same can be achieved without the declare builtin: IndexedArray=car The first option is to declare an array by using the shell builtin declare with the -a flag and give the array its elements: declare -a IndexedArray For example, we’ll use it to create a list of different means of transportation. We will start with a simple bash indexed array. It’s worth noting that the bash array size does not need to be declared beforehand because bash arrays have no upper limit on the number of elements they can store. There are a few ways to declare indexed and associative arrays in bash. Remember that bash does not support multidimensional arrays, so it’s not possible to add an array within an array.
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