Path: csiph.com!2.eu.feeder.erje.net!feeder.erje.net!goblin2!goblin1!goblin.stu.neva.ru!usenet.stanford.edu!not-for-mail
From: "" <kfm@plushkava.net>
Newsgroups: gnu.bash.bug
Subject: Re: $(<...) fails with nested quoting.
Date: Mon, 17 Aug 2020 14:20:49 +0100
Lines: 42
Approved: bug-bash@gnu.org
Message-ID: <mailman.30.1597670459.2469.bug-bash@gnu.org>
References: <09b3ac09-97ce-9bf2-fac3-e2d10113143d@gmail.com> <30c6f199-581b-dc85-3ecb-7f085b5e8c60@plushkava.net>
NNTP-Posting-Host: lists.gnu.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
To: bug-bash@gnu.org
Envelope-to: bug-bash@gnu.org
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.1.1
In-Reply-To: <09b3ac09-97ce-9bf2-fac3-e2d10113143d@gmail.com>
Content-Language: en-US
Received-SPF: pass client-ip=64.147.123.21; envelope-from=kfm@plushkava.net; helo=wout5-smtp.messagingengine.com
X-Spam_score_int: -20
X-Spam_score: -2.1
X-Spam_bar: --
X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FROM_BLANK_NAME=0.723, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=no autolearn_force=no
X-Spam_action: no action
X-BeenThere: bug-bash@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Bug reports for the GNU Bourne Again SHell <bug-bash.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/bug-bash>
List-Post: <mailto:bug-bash@gnu.org>
List-Help: <mailto:bug-bash-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=subscribe>
X-Mailman-Original-Message-ID: <30c6f199-581b-dc85-3ecb-7f085b5e8c60@plushkava.net>
X-Mailman-Original-References: <09b3ac09-97ce-9bf2-fac3-e2d10113143d@gmail.com>
Xref: csiph.com gnu.bash.bug:16764

On 17/08/2020 04:03, Steven McBride wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
> -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' 
> -DSHELL -DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib 
> -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 
> -fdebug-prefix-map=/build/bash-N2nMjo/bash-4.4.18=. 
> -fstack-protector-strong -Wformat -Werror=format-security -Wall 
> -Wno-parentheses -Wno-format-security
> uname output: Linux tau5vbub1 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 
> 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: x86_64-pc-linux-gnu
> 
> Bash Version: 4.4
> Patch Level: 20
> Release Status: release
> 
> Description:
>          'echo "$(<\"filename\")"' fails with No such file or directory 
> error.
>      'echo "$(cat \"filename\")"'  also fails no such file or directory 
> error.
>      'echo "$(<filename)"' is okay.
>      'echo $(<"filename")' is okay.
>      I think I'm doing the nested double quoting correctly.

Only in the last case. There is no bug here.

>      The quoting is because in my original case 'filename' was
>      a variable that could contained a filename with spaces in it.

"$(<"$filename")"

For an explanation, see https://mywiki.wooledge.org/CommandSubstitution.

-- 
Kerin Millar