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Re: Bug in basename builtin

From: Eli Schwartz
Subject: Re: Bug in basename builtin
Date: Wed, 18 Mar 2020 09:07:32 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 3/18/20 8:57 AM, Greg Wooledge wrote:
> On Wed, Mar 18, 2020 at 09:49:06AM +0100, Stefan Krusche wrote:
>> Am Mittwoch, 18. März 2020 schrieb Peng Yu:
>>> Hi,
>>> $ type basename
>>> basename is a shell builtin
>>> $ basename -- # kill the terminal.
>>> The above command kill the terminal. Is there a bug?
>> Hallo Peng,
>> this does not happen on my system, Devuan ascii with:
>> $ bash --version
>> GNU bash, version 4.4.12(1)-release (x86_64-pc-linux-gnu)
>> $ basename --
>> basename: missing operand
>> Try 'basename --help' for more information.
> That's the GNU coreutils version of basename.  Peng Yu is apparently
> using a loadable builtin.

On my Arch Linux system (which distributes the built contents of

[eschwartz@arch ~]$ bash
[eschwartz@arch ~]$ cd /tmp
[eschwartz@arch /tmp]$ enable -f /usr/lib/bash/basename basename
[eschwartz@arch /tmp]$ type basename
basename is a shell builtin
[eschwartz@arch ~]$ basename
basename: usage: basename string [suffix]
[eschwartz@arch /tmp]$ basename foo/bar
[eschwartz@arch /tmp]$ basename -
[eschwartz@arch /tmp]$ basename -s
bash: basename: -s: invalid option
basename: usage: basename string [suffix]
[eschwartz@arch /tmp]$ basename --help
basename: basename string [suffix]
    Return non-directory portion of pathname.

    The STRING is converted to a filename corresponding to the last
    pathname component in STRING.  If the suffix string SUFFIX is
    supplied, it is removed.
[eschwartz@arch /tmp]$ basename --
[eschwartz@arch ~]$ echo $?
[eschwartz@arch ~]$


Stefan, a GNU coreutils external program wouldn't cause the bash
interpreter to crash if it has a problem. This one here, does.

Eli Schwartz
Arch Linux Bug Wrangler and Trusted User

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