Suppose you have a string of values separated by a comma (or, in fact, any other character too)
$ string=“192.168.12.122,24,192.168.12.1,eth0,794,192.168.12.1”
Now, to be able to access each value by its position number we must turn this string into an array by defining Input Field Separator and using array population construct a=( $v ) [mind the whitespaces after the opening and before closing brackets]
$ IFS=“,” array=( $string )
Try echoing array elements:
$ echo ${array[3]}
eth0
$ echo ${array[0]}
192.168.12.122
Using read in a while-loop it should be trivial to construct a multidimensional array of array[row][value] kind.