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Groups > gnu.bash.bug > #15539

Re: Parameter expansion resulting empty treated as if it's not empty

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First two command lines lack "echo", sorry

On Wed, Oct 30, 2019 at 2:12 PM Oğuz <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?
>

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Re: Parameter expansion resulting empty treated as if it's not empty Oğuz <oguzismailuysal@gmail.com> - 2019-10-30 14:14 +0300

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