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Re: Error on arithmetic evaluation of `~0`.

From: Andreas Schwab
Subject: Re: Error on arithmetic evaluation of `~0`.
Date: Thu, 20 Dec 2018 14:46:52 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.90 (gnu/linux)

On Dez 20 2018, Greg Wooledge <address@hidden> wrote:

> The issue you're reporting appears to be present in arithmetic contexts
> in general, not only arrays:
> wooledg:~$ echo $((~0))
> bash: /home/wooledg: syntax error: operand expected (error token is 
> "/home/wooledg")

This has been fixed in bash 5.0.

> It appears that bash is performing tilde expansion when there's no
> whitespace in front of the tilde, or bitwise negation if there is
> whitespace.

POSIX says that arithmetic expressions are not subject to tilde
expansion.  IMHO bash shouldn't do that either for indexed array
subscripts, since they are arithmetic expressions.


Andreas Schwab, SUSE Labs, address@hidden
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