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Message-ID: <4DD58660.3070401@redhat.com>
Date: Thu, 19 May 2011 15:06:40 -0600
From: Eric Blake <eblake AT redhat DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: -a $HOME/.bashrc and -a ~/.bashrc produce different results
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On 05/19/2011 02:54 PM, Lee Maschmeyer wrote:
> Hi all,
>=20
> For most uses, $HOME and ~ produce identical results. For example, ls
> $HOME or ls ~ are the same. But the following script fails:
>=20
> Presumably I'm doing something nefarious but I can't figure out what.

I can.  And it's not cygwin-specific.

> for i in "$HOME/.bashrc" "~/.bashrc" ; do

"$HOME" expands $HOME, but "~/.bashrc" does _not_ expand ~.  For
tilde-expansion to occur, it must be unquoted.

>    if [ -a "$i" ]; then

Use 'set -vx' to see what was really run.  The first iteration ran:

'[' '-a' '/home/blah/.bashrc' ']'

while the second ran:

'[' '-a' '~/.bashrc' ']'

>=20
> As far as I can tell I've done everything right, but I can't believe
> I've discovered a bug! I think I _am_ the bug. :-)

Correct assumption, for once :)

--=20
Eric Blake   eblake AT redhat DOT com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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