28 Şubat 2021 Pazar tarihinde Mike Jonkmans <bash...@jonkmans.nl> yazdı:
> Hi,
>
> The manual page says:
> If the function reserved word is used, but the parentheses are not
> supplied,
> the braces are required.
>
> But it seems that from all the compound commands,
> only a subshell is not possible.
>
> Some examples that work:
> function x { :; } ## as expected
> function x if :; then :; fi
> function x (( 42 ))
> function x [[ 42 ]]
> function x for x do :; done
> function x for (( ; 42 - 42 ; )); do :; done
>
> What does not work:
> function x ( : )
Works fine here.
bash-5.1$ function x ( : )
bash-5.1$ declare -f x
x ()
{
( : )
}
>
>
> From looking at the bash grammar I am not sure why a subshell does not
> work.
> As the subshell can be differentiated from the optional parentheses.
>
>
> Though it may be handy to disallow a subshell.
> If in the future named parameters would become a possibility.
> E.g.
> function x (a=$1 b=$2)
> { echo "$a$b; }
> would become ambiguous.
>
>
> Note that the Posix grammar doesn't mention the word 'function'.
> Posix does mention it, as reserved word recognized by 'some
> implementations'
> and causing undefined behavior.
>
>
> Regards, Mike Jonkmans
>
>
--
Oğuz
