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Re: $(<...) fails with nested quoting.

Subject: Re: $(<...) fails with nested quoting.
Date: Mon, 17 Aug 2020 14:20:49 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.1.1

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

        '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.


For an explanation, see https://mywiki.wooledge.org/CommandSubstitution.

Kerin Millar

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