bash support one-dimensional array (not support multi-dimensional array), and do not limit the size of the array. Subscript array elements are numbered starting from zero. To obtain the use of elements in the array subscript or index may be an integer arithmetic expression
Get all the array of all the elements
Gets the number of elements
Get element subscript 2
3
Gets the last element
Assignment to assignment to a string array vs
Automatically create an array
