On 28/11/2021 14:11, Marc Chantreux wrote:
hello people,
I'm porting scripts from zsh to dash using version
0.5.11+git20200708+dd9ef66-5 from debian and
surprised to realize that the result of a glob failure is the glob
itself (when i expected an empty string).
Hi, yes, this is expected, this is standard POSIX sh behaviour and
implemented by all POSIX sh-compatible shells. It should even be what
zsh does when running in POSIX mode, but I do not have it installed
right now to check.
In bash, it is optional, you get the glob itself by default, but there
is a "nullglob" shell option you can set to get what you are asking for.
In ksh, it is optional, you get the glob itself by default, but there is
a special thing where you can start a glob with ~(N) to change only that
glob only to expand to nothing if there is no match.
Both of those are valid extensions that don't affect POSIX conformance.
I personally suspect dash will not want to implement either extension
until POSIX decides which extension, if either/any, to standardise at
some point.
Cheers,
Harald van Dijk
