Path: csiph.com!xmission!news.snarked.org!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail
From: =?UTF-8?B?T8SfdXo=?= <oguzismailuysal@gmail.com>
Newsgroups: gnu.bash.bug
Subject: Re: Parameter expansion resulting empty treated as if it's not empty
Date: Wed, 30 Oct 2019 14:14:43 +0300
Lines: 36
Approved: bug-bash@gnu.org
Message-ID: <mailman.45.1572434100.22196.bug-bash@gnu.org>
References: <CAH7i3Lp79s5Kpe+kg6thQtqpaVai19HMoDW1SXNF9Ae71p7HGQ@mail.gmail.com> <CAH7i3Loshnfd7y_MLhRbPmhBVvwWoPBj3g8c-3zcyL2+duqoKQ@mail.gmail.com>
NNTP-Posting-Host: lists.gnu.org
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
To: bug-bash@gnu.org
Envelope-to: bug-bash@gnu.org
In-Reply-To: <CAH7i3Lp79s5Kpe+kg6thQtqpaVai19HMoDW1SXNF9Ae71p7HGQ@mail.gmail.com>
Precedence: list
Xref: csiph.com gnu.bash.bug:15539

First two command lines lack "echo", sorry

On Wed, Oct 30, 2019 at 2:12 PM O=C4=9Fuz <oguzismailuysal@gmail.com> wrote=
:

> Since
>
> bash -c '${1##*""}' _ foo
>
> prints an empty line, I was expecting
>
> bash -c '${1##*"${1##*}"}' _ foo
>
> to print an empty line too, but instead it prints foo.
>
> Other shells I could find don't have this problem
>
> $ sh -c 'echo "${1##*"${1##*}"}"' _ bar
>
> $ ash -c 'echo "${1##*"${1##*}"}"' _ bar
>
> $ dash -c 'echo "${1##*"${1##*}"}"' _ bar
>
> $ ksh -c 'echo "${1##*"${1##*}"}"' _ bar
>
> $ yash -c 'echo "${1##*"${1##*}"}"' _ bar
>
> $ zsh -c 'echo "${1##*"${1##*}"}"' _ bar
>
> $ bash -c 'echo "${1##*"${1##*}"}"' _ bar
> bar
> $ bash --posix -c 'echo "${1##*"${1##*}"}"' _ bar
> bar
>
> Is this a bug?
>