Bash has had real arrays since 2.0 (1996). Though, the `+=` operator to append to an array wasn't added until 3.1 (2005); before that you had to do `array[${#ar

Bash has had real arrays since 2.0 (1996). Though, the `+=` operator to append to an array wasn't added until 3.1 (2005); before that you had to do `array[${#array[*]}]=word` to append. Since 4.0 (2009) it's also had associative arrays.