Re: read-only flag is lost for functions in sub shells

[Greg Wooledge]

On Thu, Jul 31, 2014 at 07:51:01AM -0700, Linda Walsh wrote:
> Chet Ramey wrote:
> >$ ./bash ./x24
> >4.2.47(4)-release
> >foo = one
> >foo = two
> >$ cat ./x24
> >echo $BASH_VERSION
> >
> >foo=one
> >readonly foo
> >export foo
> >
> >./bash -c 'echo foo = $foo ; foo=two ; echo foo = $foo'
> 
> When did that change?

You might be confusing subshells with explicit new process creation.
Attributes like readonly are not passed through the environment.
How could they be?  What out-of-band facility is available to mark
environment variables as having these attributes?

imadev:~$ cat ./x24
echo "$BASH_VERSION"
foo=one
readonly foo
export foo
bash-2.05b -c 'echo "foo=<$foo>"; foo=two; echo "foo=<$foo>"'
imadev:~$ bash-2.05b ./x24
2.05b.0(2)-release
foo=<one>
foo=<two>