globbing in assignment

globbing in assignment

[Han Pingtian]

Hello,

I just notice filename globbing doesn't occur in my script, like 

v=*

but it works in the interactive shell. Althoug I can make it work
by "setop glob_assign" or use "v=(*)", but it looks like the behavior's
diversity is a little strange.

Any thoughts?

Thanks.

Re: globbing in assignment

[Peter Stephenson]

On Wed, 23 May 2012 14:18:59 +0800
Han Pingtian <hanpt@linux.vnet.ibm.com> wrote:
> I just notice filename globbing doesn't occur in my script, like 
> 
> v=*
> 
> but it works in the interactive shell. Althoug I can make it work
> by "setop glob_assign" or use "v=(*)", but it looks like the behavior's
> diversity is a little strange.
> 
> Any thoughts?

I would guess you don't have the option set in one case, but do in
another.  Try putting "setopt globassign" at the start of the script,
which seems to do what I expect here.  There's no explicit code to stop
it working in scripts.

-- 
Peter Stephenson <pws@csr.com>            Software Engineer
Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, UK


Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom
More information can be found at www.csr.com. Follow CSR on Twitter at http://twitter.com/CSR_PLC and read our blog at www.csr.com/blog

Re: globbing in assignment

[Han Pingtian]

On Wed, May 23, 2012 at 10:10:43AM +0100, Peter Stephenson wrote:
> On Wed, 23 May 2012 14:18:59 +0800
> Han Pingtian <hanpt@linux.vnet.ibm.com> wrote:
> > I just notice filename globbing doesn't occur in my script, like 
> > 
> > v=*
> > 
> > but it works in the interactive shell. Althoug I can make it work
> > by "setop glob_assign" or use "v=(*)", but it looks like the behavior's
> > diversity is a little strange.
> > 
> > Any thoughts?
> 
> I would guess you don't have the option set in one case, but do in
> another.  Try putting "setopt globassign" at the start of the script,
> which seems to do what I expect here.  There's no explicit code to stop
> it working in scripts.
Thanks for reply. I don't set globassign in the interactive shell but
the globbing is working in assigment. And finally I find out it's
"glob_subst" which also has the same effect of "glob_assign". Maybe
something is wrong?


Looks like ther
> 
> -- 
> Peter Stephenson <pws@csr.com>            Software Engineer
> Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
> Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, UK
> 
> 
> Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom
> More information can be found at www.csr.com. Follow CSR on Twitter at http://twitter.com/CSR_PLC and read our blog at www.csr.com/blog

Re: globbing in assignment

[Peter Stephenson]

On Wed, 23 May 2012 18:08:46 +0800
Han Pingtian <hanpt@linux.vnet.ibm.com> wrote:
> Thanks for reply. I don't set globassign in the interactive shell but
> the globbing is working in assigment. And finally I find out it's
> "glob_subst" which also has the same effect of "glob_assign".

Ah, you're misunderstanding what's going on.

GLOB_ASSIGN has the effect that

v=*

expands * at this point.  The value of v contains all the files.

GLOB_SUBST has the effect that a variable is expanded at the point where
it's substituted.  So without GLOB_ASSIGN, or equivalently quoting the
value assigned to v,

% v='*'
% setopt globsubst
% print $v
<files>
% unsetopt globsubt
% print $v
*

-- 
Peter Stephenson <pws@csr.com>            Software Engineer
Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, UK


Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom
More information can be found at www.csr.com. Follow CSR on Twitter at http://twitter.com/CSR_PLC and read our blog at www.csr.com/blog

Re: globbing in assignment

[Han Pingtian]

On Wed, May 23, 2012 at 11:30:56AM +0100, Peter Stephenson wrote:
> On Wed, 23 May 2012 18:08:46 +0800
> Ah, you're misunderstanding what's going on.
> 
> GLOB_ASSIGN has the effect that
> 
> v=*
> 
> expands * at this point.  The value of v contains all the files.
> 
> GLOB_SUBST has the effect that a variable is expanded at the point where
> it's substituted.  So without GLOB_ASSIGN, or equivalently quoting the
> value assigned to v,
> 
> % v='*'
> % setopt globsubst
> % print $v
> <files>
> % unsetopt globsubt
> % print $v
> *
> 
Thanks. Now I got it.