Difference between bracket and double parentheses?

Question

What's the difference between these two? Example:

$ echo $((1+1))
2
$ echo $[1+1]
2

refer http://stackoverflow.com/questions/2188199/how-to-use-double-or-single-bracket-parentheses-curly-braces — Keval Doshi, Aug 14 '13 at 15:13

score 1 · Answer 1 · answered Aug 14 '13 at 15:13

1

$[expression] is deprecated syntax, to accomplish same thing.

answered Aug 14 '13 at 15:13

anishsane

why did they deprecate it? – Jürgen Paul Aug 14 '13 at 15:18
ask them :P (I don't know why they did :( ... ) – anishsane Aug 14 '13 at 15:20
1

See http://stackoverflow.com/a/11911564/1983854 over there they quote the reasons (interesting, by the way). – fedorqui Aug 14 '13 at 15:21

1 Answers1