How can I use File::Find in Perl?

Question

我对File::Find文档感到有点困惑...等于$ find my_dir -maxdepth 2 -name "*.txt" ？

Answer 1

Personally, I prefer File::Find::Rule as this doesn't need you to create callback routines.

use strict;
use Data::Dumper;
use File::Find::Rule;

my $dir = shift;
my $level = shift // 2;

my @files = File::Find::Rule->file()
                            ->name("*.txt")
                            ->maxdepth($level)
                            ->in($dir);

print Dumper(\@files);

Or alternatively create an iterator:

my $ffr_obj = File::Find::Rule->file()
                              ->name("*.txt")
                              ->maxdepth($level)
                              ->start($dir);

while (my $file = $ffr_obj->match())
{
    print "$file\n"
}

Answer 2

I think I'd just use a glob since you really don't need all the directory traversal stuff:

 my @files = glob( '*.txt */*.txt' );

I made File::Find::Closures to make it easy for you to create the callbacks that you pass to find :

 use File::Find::Closures qw( find_by_regex );
 use File::Find qw( find );

 my( $wanted, $reporter ) = File::Find::Closures::find_by_regex( qr/\.txt\z/ );

 find( $wanted, @dirs );

 my @files = $reporter->();

Normally, you can turn a find(1) command into a Perl program with find2perl (removed in v5.20 but on CPAN):

% find2perl my_dir -d 2  -name "*.txt"

But apparently find2perl doesn't understand -maxdepth , so you could leave that off:

% find2perl my_dir -name "*.txt"
#! /usr/local/perls/perl-5.13.5/bin/perl5.13.5 -w
    eval 'exec /usr/local/perls/perl-5.13.5/bin/perl5.13.5 -S $0 ${1+"$@"}'
        if 0; #$running_under_some_shell

use strict;
use File::Find ();

# Set the variable $File::Find::dont_use_nlink if you're using AFS,
# since AFS cheats.

# for the convenience of &wanted calls, including -eval statements:
use vars qw/*name *dir *prune/;
*name   = *File::Find::name;
*dir    = *File::Find::dir;
*prune  = *File::Find::prune;

sub wanted;



# Traverse desired filesystems
File::Find::find({wanted => \&wanted}, 'my_dir');
exit;


sub wanted {
    /^.*\.txt\z/s
    && print("$name\n");
}

Now that you have the starting programming, you can plug in whatever else you need, including a preprocess step to prune the tree.

Answer 3

use File::Find ; 
use Cwd ; 

my $currentWorkingDir = getcwd;

my @filesToRun = ();
my $filePattern = '*.cmd' ; 
#add only files of type filePattern recursively from the $currentWorkingDir
find( sub { push @filesToRun, $File::Find::name  
                                    if ( m/^(.*)$filePattern$/ ) }, $currentWorkingDir) ;

foreach  my $file ( @filesToRun  ) 
{
    print "$file\n" ;   
} 

Answer 4

There's also the handy find2perl utility. Use it instead of the Unix find command, with the same command-line arguments as 'find', and it will generate the corresponding Perl code that makes use of File::Find.

$ find2perl my_dir -maxdepth 2 -name "*.txt"