Exclusion on filename expansion

Exclusion on filename expansion

[Vin Shelton]

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Using a variable, I cannot get ~ exclusion to work:

setopt extended_glob
mkdir foo
cd foo
touch abc def ghi jkl
ls *~abc~def
  ==> ghi jkl
pat="abc~def"
ls -d *~$pat
  ==> abc  def  ghi  jkl

I think that expansion of $pat is happening after globbing, so in this case
"*" expands to

abc def ghi jkl

without the application of the tilde exclusion.

Is there something I can do about this?

Thanks,
  Vin

Re: Exclusion on filename expansion

[Peter Stephenson]

Vin Shelton wrote:
> Using a variable, I cannot get ~ exclusion to work:
>
> ls *~abc~def
>   ==> ghi jkl
> pat="abc~def"
> ls -d *~$pat
>   ==> abc  def  ghi  jkl
> 
> I think that expansion of $pat is happening after globbing, so in this case
> "*" expands to
> 
> abc def ghi jkl
> 
> without the application of the tilde exclusion.
> 
> Is there something I can do about this?

"setopt glob_subst", or probably better use $~pat which turns on
glob_subst for that expansion.  The "~" may appear to be an obvious
mnemonic, but actually it was originally introduced to do the more
standard form of ~-expansion.  It now turns on that and glob expansion.

pws

Re: Exclusion on filename expansion

[Bart Schaefer]

On Dec 7,  1:50pm, Vin Shelton wrote:
}
} pat="abc~def"
} ls -d *~$pat
}   ==> abc  def  ghi  jkl
} 
} I think that expansion of $pat is happening after globbing

No, but the expansion of $pat is not a pattern unless you make it one.

ls -d *~${~pat}

(the braces are optional in zsh default emulation, used here for clarity).

Re: Exclusion on filename expansion

[Vin Shelton]

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Thank you, Peter and Bart.

  - Vin

On Sun, Dec 7, 2014 at 2:01 PM, Peter Stephenson <
p.w.stephenson@ntlworld.com> wrote:

> Vin Shelton wrote:
> > Using a variable, I cannot get ~ exclusion to work:
> >
> > ls *~abc~def
> >   ==> ghi jkl
> > pat="abc~def"
> > ls -d *~$pat
> >   ==> abc  def  ghi  jkl
> >
> > I think that expansion of $pat is happening after globbing, so in this
> case
> > "*" expands to
> >
> > abc def ghi jkl
> >
> > without the application of the tilde exclusion.
> >
> > Is there something I can do about this?
>
> "setopt glob_subst", or probably better use $~pat which turns on
> glob_subst for that expansion.  The "~" may appear to be an obvious
> mnemonic, but actually it was originally introduced to do the more
> standard form of ~-expansion.  It now turns on that and glob expansion.
>
> pws
>