Bash supports two types of one-dimensional arrays. Multidimensional arrays aren’t supported.

• Indexed Arrays
• Associative Arrays

Indexed Arrays #

Indexed arrays use integer numbers as keys.

Associative arrays (aka dictionaries) #

Associative arrays use nonempty strings as keys.

Referencing #

Referencing array variables and their individual elements.

Uses arrname[subscript] syntax. For indexed arrarys subscript is any valid arithmetic expression and for associative arrays subscript is a nonempty string.

i[akraker@localhost]$ arr=('Peter' 'Anna' 'Greg' 'Jan')
i[akraker@localhost]$ echo ${arr[0]}
Peter