De man 1 bash
:
Arrays
Bash provides one-dimensional indexed and associative array variables. Any variable
may be used as an indexed array; the declare builtin will explicitly declare an
array. There is no maximum limit on the size of an array, nor any requirement that
members be indexed or assigned contiguously. Indexed arrays are referenced using
integers (including arithmetic expressions) and are zero-based; associative arrays
are referenced using arbitrary strings. Unless otherwise noted, indexed array
indices must be non-negative integers.
Frase-chave:
Bash provides one-dimensional indexed and associative array variables.
Portanto, não, o bash não suporta matrizes multidimensionais.