Re: Re: Create a list of directories without . and ..

you can also use File::Find (as i've recently found)

something like: (i've not tested this!)

my @found;
File::Find::find({wanted => \&wanted], '.');

sub wanted  {
     if (-d $_) && ($_ != '.') && ($_ != '..') {
          push(@found, $_)
     }
}
[download]

sure, this is not the fastest way (someone on the above referenced node timed the native find vs File::Find, with native winning by a factor of 5), but it's a way.

also, be careful of the greps to remove the . and .. entries... it's legal to have directories that start with a period (or two, or more), so you have to do an exact match on both cases.

(i think)

i too am a newbie here, and i've been thanking people...
hopefully, i can provide some answers myself one day.

(ps: please forgive the expanded syntax, but it's (to my unPerlish eye) easier to read!)

Comment on Re: Re: Create a list of directories without . and .. Download Code

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Re: Re: Re: Create a list of directories without . and .. by dsheroh (Monsignor) on Jun 04, 2002 at 19:37 UTC
You are correct about . and .. - getting a regex to match them reliably is far trickier than it looks. The obvious `m/^\.\.?$/`, for instance, will give a false positive on "..\nsubdir". Much safer and simpler to just test on `($_ ne '.') && ($_ ne '..')`. (BTW, `!=` is numeric. Use `ne` for strings.)	[reply] [d/l] [select]
Re: Re: Re: Re: Create a list of directories without . and .. by Juerd (Abbot) on Jun 04, 2002 at 22:41 UTC
The obvious m/^\.\.?$/, for instance, will give a false positive on "..\nsubdir" No, only on "..\n" and ".\n". - Yes, I reinvent wheels. - Spam: Visit eurotraQ.	[reply]
Re: Re: Re: Create a list of directories without . and .. by Juerd (Abbot) on Jun 04, 2002 at 22:39 UTC
if (-d $_) && ($_ != '.') && ($_ != '..') { This is invalid syntax (needs an extra set of parens) and the != operator is not the one you want for string equality tests. I think you meant: `if (-d and $_ ne '.' and $_ ne '..') {` [download] -d uses $_ if no argument is given. - Yes, I reinvent wheels. - Spam: Visit eurotraQ.	[reply] [d/l]
Re: Re: Re: Re: Create a list of directories without . and .. by Anonymous Monk on Jun 05, 2002 at 04:15 UTC
Hi. Still having trouble with this...I do not understand why calling "test.pl ." finds subdirs in the Products subdir if I run it there and pass "." as the arg but doesn't find them if I run it one level back (ie. CD ..)and pass "./Products" as the arg?? This is true which ever of the two filter clauses I use. I *hate* being a "newbie" again. C:\www\NB.biz\html>type test.pl #!/usr/bin/perl -w use strict; use diagnostics; print $ARGV[0], "\n"; opendir(DIR, $ARGV[0] ) or die ".: $!"; #my @list = grep { -d and /^\.\.?/ } readdir(DIR); my @list = grep { -d $_ and $_ ne '.' and $_ ne '..'} readdir(DIR); closedir(DIR); print foreach ( @list ), "\n"; C:\www\NB.biz\html>test.pl . . cssgraphicsProducts C:\www\NB.biz\html>test.pl ./products ./products <<<< NO OUTPUT HERE??? C:\www\NB.biz\html>test.pl ./Products/ ./Products/ <<<< OR HERE???? C:\www\NB.biz\html>cd products C:\www\NB.biz\html\Products>../test.pl . . Books C:\www\NB.biz\html\Products> [download] Thanks, NJ Sandever.	[reply] [d/l]


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