Re: GLOBIGNORE documentation

[Stephane Chazelas]

2016-03-07 08:58:05 +0100, Isabella Parakiss:
[...]
> OTOH this is arguably more useful than its ksh equivalent:
> GLOBIGNORE=-*; some-cmd *; some-cmd ./*
[...]

True, that's probably the one case where the GLOBIGNORE
behaviour is actually useful.

Note that with ksh93, you've got to write it:

FIGNORE='@(.|..|-*)'

That is, you need to exclude "." and ".." manually.

-- 
Stephane

Re: GLOBIGNORE documentation

[Isabella Parakiss]

On Sun, Mar 06, 2016 at 10:16:58PM +, Stephane Chazelas wrote:
> Today, I realised that GLOBIGNORE doesn't work at all like ksh's
> FIGNORE.
> 
> With
> 
> GLOBIGNORE=x*
> 
> we're not filtering out files whose *name* starts with "x" from
> globs but those whose *path* starts with "x".
> 
> In
> 
> echo *
> 
> files whose name starts with "x" will be excluded, but not in
> 
> echo ./*
> 

OTOH this is arguably more useful than its ksh equivalent:
GLOBIGNORE=-*; some-cmd *; some-cmd ./*


---
xoxo iza

GLOBIGNORE documentation

[Stephane Chazelas]

Today, I realised that GLOBIGNORE doesn't work at all like ksh's
FIGNORE.

With

GLOBIGNORE=x*

we're not filtering out files whose *name* starts with "x" from
globs but those whose *path* starts with "x".

In

echo *

files whose name starts with "x" will be excluded, but not in

echo ./*

I think the documentation should be clarified, because at the
moment it implies GLOBIGNORE applies to file names (like for
ksh's FIGNORE), not file paths.

Where it becomes borderline a bug is about "." and "..".

The doc says they're always excluded when GLOBIGNORE is
non-empty.

That's true for */* or .* for instance, but not for ./.* or .*/x
for instance.

$ bash -c 'GLOBIGNORE=x*; echo .*'
.*
$ bash -c 'GLOBIGNORE=x*; echo ./.*'
./. ./..
$ bash -c 'GLOBIGNORE=x*; echo .*/a'
./a ../a

To truely exclude . and .., one needs:

shopt -s extglob
GLOBIGNORE='?(*/)@(.|..)'

-- 
Stephane

Re: GLOBIGNORE documentation

[Stephane Chazelas]

2016-03-06 22:16:58 +, Stephane Chazelas:
[...]
> $ bash -c 'GLOBIGNORE=x*; echo .*'
> .*
> $ bash -c 'GLOBIGNORE=x*; echo ./.*'
> ./. ./..
> $ bash -c 'GLOBIGNORE=x*; echo .*/a'
> ./a ../a
> 
> To truely exclude . and .., one needs:
> 
> shopt -s extglob
> GLOBIGNORE='?(*/)@(.|..)'
[...]

That's not enough, that would fail to exclude . and .. in
.*/file (and also breaks */. globs)

GLOBIGNORE='?(*/)@(.|..)?(/*)' would break (common) ./* globs.

So, it looks like it's not possible to get the same behaviour as
in zsh/mksh/pdksh/fish/Forsyth shell (or ksh93 with
FIGNORE='@(.|..)') with GLOBIGNORE after all.

-- 
Stephane