Bash – $(( )) vs. $[]

[Johnny Rosenberg]

~$ a=3
~$ b=4
~$ echo $(($a+$b))
7
~$ echo $[$a+$b]
7
~$


So are these syntaxes equivalent? If not, what are the differences?



Kind regards

Johnny Rosenberg
ジョニー・ローゼンバーグ