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Solved
-d and Find::File::name
Posted on 2003-02-26
Hi,
I have this snippet of code in which I am trying to print out all the directories. It does not work using the -d, but -f does print all the files. Why doesn't -d work for directories? What am I doing wrong? This should be a pretty basic question for an experienced Perl programmer.
<code>
use strict;
use File::Find;
sub wanted
{
if (-d $File::Find::name)
{
print "$File::Find::name\n";
}
}
find(\&wanted, 'C:/');
</code>
many thanks,
Barry
I have this snippet of code in which I am trying to print out all the directories. It does not work using the -d, but -f does print all the files. Why doesn't -d work for directories? What am I doing wrong? This should be a pretty basic question for an experienced Perl programmer.
<code>
use strict;
use File::Find;
sub wanted
{
if (-d $File::Find::name)
{
print "$File::Find::name\n";
}
}
find(\&wanted, 'C:/');
</code>
many thanks,
Barry
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2 Comments
use strict;
use File::Find;
sub wanted
{
print "$File::Find::name\n" if -d;
}
find(\&wanted, 'C:/');
use File::Find;
sub wanted
{
print "$File::Find::name\n" if -d;
}
find(\&wanted, 'C:/');
>> What am I doing wrong?
Your program works for -f and for -d.
But if you specify a relative path (eg '.') instead of the absolute 'c:/' then the program does not work as expected. The reason is that 'wanted' changes to the current directory as it tunnels through the directory structure.
So if the program started in '.' (which happens to be c:/) then when it gets to WinNT and asks "Is ./WinNt/System32 a valid directory" the answer will obviously be 'No'.
If you change your 'if' line to
if (-d $_)
(which if equivalent to 'if (-d)')
then everything will work because, for example, when in WinNT the question will be "Is System32 a valid directory", and the answer will obviously be 'Yes'.
Your program works for -f and for -d.
But if you specify a relative path (eg '.') instead of the absolute 'c:/' then the program does not work as expected. The reason is that 'wanted' changes to the current directory as it tunnels through the directory structure.
So if the program started in '.' (which happens to be c:/) then when it gets to WinNT and asks "Is ./WinNt/System32 a valid directory" the answer will obviously be 'No'.
If you change your 'if' line to
if (-d $_)
(which if equivalent to 'if (-d)')
then everything will work because, for example, when in WinNT the question will be "Is System32 a valid directory", and the answer will obviously be 'Yes'.
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