Perl | Finding Files and Directories - GeeksforGeeks

19 Jul, 2019
For traversing a directory tree in Perl, there are several ways/methods. Traversing can be performed through function calls opendir and readdir which are a part of Perl programming language. Traversing files and directories in Perl can also be done through File::Find module which comes with the Perl language.
File::Find contains 2 modules:
Find: find() function performs a depth-first search on the mentioned/defined @directories. It calls and invokes the "&wanted" function for each file or sub-directory found in that directory. find() works from top to down.
Finddepth: finddepth() performs a post-order traversal instead of performing pre-order, working from down to top. Working of finddepth() function is almost similar to the find() function except for the fact that it invokes &wanted for directory’s content first than invokes it for the directory.
The only difference among both the modules is the order in which the files and directories are parsed. Find modules in Perl has all the functions similar to the Unix Find command.Find function takes two arguments:
1st argument is a subroutine called for each file which we found through find function.
2nd argument is the list of the directories where find function is going to search the files.
Following are some example scripts of Perl to find the Files and Directories:Example 1: To print all the available directories in the searched folder.
#!usr/bin/perlprint "content-type: text/html\n\n";  use strict;use warnings;use File::Find;  find({    wanted => \&findfiles,},'GeeksforGeeks');  sub findfiles{       #To search only the directory    print "$File::Find::dir\n";  }exit;
Output: Example 2: To print out the files available in a directory
#!usr/bin/perlprint "content-type: text/html\n\n";   use strict;use warnings;use File::Find;   find({    wanted => \&findfiles,},'GeeksforGeeks');   sub findfiles{        #To search the files inside the directories    print "$File::Find::name\n";  }exit;
Output: Example 3: Printing only once all the directories available/present in the folder/directory we are accessing.
#!usr/bin/perlprint "content-type: text/html\n\n";   use strict;use warnings;use File::Find;   find({    wanted => \&findfiles,},'GeeksforGeeks');   sub findfiles{        # To search all the available directories     # in the given directory without accessing them    print "$File::Find::name\n" if -d;    }exit;
Output: Example 4: To access the files present inside a directory without accessing the other directories available in that same directory.
#!usr/bin/perlprint "content-type: text/html\n\n";   use strict;use warnings;use File::Find;   find({    wanted => \&findfiles,},'GeeksforGeeks');   sub findfiles{    # Not accessing Geeks_New and Image directory    # present inside the dir GeeksforGeeks    $File::Find::prune = 1 if /Geeks_New/;    $File::Find::prune = 1 if /Images/;          # To print the files present in dir GeekforGeeks    print "$File::Find::name\n";  }exit;
Output: Example 5: Use of finddepth() function to find the files and sub-directories in a directory.
#!usr/bin/perlprint "content-type: text/html\n\n";   use strict;use warnings;use File::Find;   finddepth({    wanted => \&findfiles,},'GeeksforGeeks');   sub findfiles{    print "$File::Find::name\n";}exit;
 Example 6: To find all types of text files.
#!usr/bin/perlprint "content-type: text/html\n\n";   use strict;use warnings;use File::Find;   find({    wanted => \&findfiles,},'GeeksforGeeks');   sub findfiles{       print "$File::Find::name\n" if -T;}exit;
Output:
Perl-files
Perl
Perl
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