[Shell] a usage of constructing and traversing two-digit arrays

[Shell] constructs and traverses two-dimensional arrays. for a usage reference, see some operations on shell arrays. this provides a way to construct and traverse two-dimensional arrays, as shown below: [plain] the array elements are separated by spaces (& quot; wwwacomwwwbcomwwwccomwwwdcom & quot; www [shell] is used to construct and traverse two-dimensional arrays. refer to some operations of shell arrays to construct and traverse two-dimensional arrays: [plain] # Split the array element by space into sites = ("www.a.com www. B .com www.c.com www.d.com" "www.e.cn www.f.cn ") n_sites =$ {# sites [*]} # obtain the length of the one-dimensional sites array for (I = 0; I <$ n_sites; I ++ )); do inner_sites = ($ {sites [$ I]}) # assign a one-dimensional sites string to the array n_in Ner_sites =$ {# inner_sites [*]} # obtain the length of the two-dimensional sites array for (j = 0; j <$ n_inner_sites; j ++ )); do echo $ {inner_sites [$ j]} # echo site # do something done. it is worth noting that the separator in shell is a space instead of a comma. In addition, the array element Traversal function is [html] for ele in $ {arrayname [*]} do echo $ ele done.