> In modifying some released code on my distro, I ran into the extensive use
> of $[arith] as a means for returning arithmetic evaluations of the
> I vaguely remember something like that from years ago, but never see any
> reference to
> it -- yet it works, and old code seems to rely on it -- and
> "$[(1+2)/3]" looks cleaner than "$(((1+2)/3))". So what's up with that?
At the minor expense of a few extra keystrokes, $(( (1+2) / 3 ))
looks just as clean, and has the added cachet of being portable.
Chris F.A. Johnson, <http://cfajohnson.com/>
Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)