| Description | Indexed array | Associative array |
| Declare an array | declare -a array | declare -A array |
| Assignment | array=(value1 value2 … valuen) | array=([sub1]=value1 … [subN]=valueN) Note:You must declare it first you can use declare -A array=([sub1]=value1 … [subN]=valueN) |
| Expand to all values | ${array[@]} or ${array[*]} | ${array[@]} or ${array[*]} |
| Expand to all keys | ${!array[@]} or ${!array[*]} | ${!array[@]} or ${!array[*]} |
| length of an array | ${#array[@]} or ${#array[*]} | ${#array[@]} or ${#array[*]} |
| Remove entire array | unset array or unset array[@] or unset array[*] | unset array or unset array[@] or unset array[*] |
| Remove an element | unset array[index] | unset array[index] |
| Array join | array1+=(${array2[@]}) or array1+=(v1 v2 … vN) | array1+=([sub1]=v1 [sub2]=v2 … [subN]=vN) |
| Length of an element: | ${#array[index]} | ${#array[index]} |
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