Bash array, bash

Bash array, bash
Bash only supports one-dimensional arrays. And the array subscript starts from 0.
Assign values to Arrays:
Array = (1 4 7 2 5 8) # use space as the delimiter and () as the array
Str = "this is test string"
Str_arr = ($ str); # separated by spaces by default
Array traversal:
For val in str_arr [*]; do echo $ val; done
For file in 'LS'; do echo $ file; done
Number of array elements: $ {# array}

For example, each character in a string is split into an array.
Hjj @ ThinkPad :~ $ Str = "long string"
Hjj @ ThinkPad :~ $ For (I = 0; I <$ {# str}; I ++) do a [I] =$ {str: $ I: 1 }; echo $ {a [I]}; done;
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