Op 23-03-17 om 15:44 schreef Dan Douglas:
> On 03/23/2017 04:49 AM, Jean Delvare wrote:
>> Apparently it requires a more recent version of mksh than we are
>> shipping:
>
> Herestrings are old. Should work in just about any ksh.
They're a ksh93-ism, not a ksh88-ism. pdksh (including OpenBSD ksh)
doesn't have them.
On those (as on POSIX), you need a here-document to get the same effect:
while stuff; do
stuff
done <<EOF
$(cmd)
EOF
>> $ echo $KSH_VERSION @(#)MIRBSD KSH R50 2014/06/29 openSUSE $
>> ./test_return.sh ./test_return.sh[10]: syntax error: '('
>> unexpected
>>
>> But indeed works find with the latest upstream version, thanks
>> for the pointer.
>
> It's also not at all equivalent to a pipe. The shell reads the
> command output from a pipe, stripping trailing newlines, and dumps
> the result into a temporary file, which then adds a trailing
> newline, then reads the file back into whatever runs in the loop.
In most use cases, that seems like a distinction without a difference.
> It will also fail if it expands to more than one word due to lack
> of quotes. (That likely caused your error)
That is true on bash, but not on mksh. I should probably have added
the quotes anyway though, just to avoid that confusion.
- M.
