source: vendor/perl/5.8.8/NetWare/t/NWModify.pl

print "\nModifying the '.t' files...\n\n";

use File::Basename;
use File::Copy;

## Change the below line to the folder you want to process
$DirName = "/perl/scripts/t";

$FilesTotal = 0;
$FilesRead = 0;
$FilesModified = 0;

opendir(DIR, $DirName);
@Dirs = readdir(DIR);

foreach $DirItem(@Dirs)
{
        $DirItem = $DirName."/".$DirItem;
        push @DirNames, $DirItem;       # All items under  $DirName  folder is copied into an array.
}

foreach $FileName(@DirNames)
{
        if(-d $FileName)
        {       # If an item is a folder, then open it further.

                opendir(SUBDIR, $FileName);
                @SubDirs = readdir(SUBDIR);
                close(SUBDIR);

                foreach $SubFileName(@SubDirs)
                {
                        if(-f $SubFileName)
                        {
                                &Process_File($SubFileName);    # If file, process it.
                        }
                        else
                        {
                                $SubFileName = $FileName."/".$SubFileName;
                                push @DirNames, $SubFileName;   # If sub-folder, push it into the array.
                        }
                }
        }
        else
        {
                if(-f $FileName)
                {
                        &Process_File($FileName);       # If file, process it.
                }
        }
}

close(DIR);

print "\n\n\nTotal number of files present = $FilesTotal\n";
print "Total number of '.t' files read = $FilesRead\n";
print "Total number of '.t' files modified = $FilesModified\n\n";




# Process the file.
sub Process_File
{
        local($FileToProcess) = @_;             # File name.
        local($Modified) = 0;

        if(!(-w $FileToProcess)) {
                # If the file is a read-only file, then change its mode to read-write.
                chmod(0777, $FileToProcess);
        }

        ## For example:
        ## If the value of $FileToProcess is '/perl/scripts/t/pragma/warnings.t', then
                ## $dir = '/perl/scripts/t/pragma/'
                ## $base = 'warnings'
                ## $ext = '.t'
        $dir = dirname($FileToProcess);         # Get the folder name
        $base = basename($FileToProcess);       # Get the base name
        ($base, $dir, $ext) = fileparse($FileToProcess, '\..*');        # Get the extension of the file passed.


        # Do the processing only if the file has '.t' extension.
        if($ext eq '.t') {

                open(FH, "+< $FileToProcess") or die "Unable to open the file,  $FileToProcess  for reading and writing.\n";
                @ARRAY = <FH>;  # Get the contents of the file into an array.

                foreach $Line(@ARRAY)   # Get each line of the file.
                {
                        if($Line =~ m/\@INC = /)
                        {       # If the line contains the string (@INC = ), then replace it

                                # Replace "@INC = " with "unshift @INC, "
                                $Line =~ s/\@INC = /unshift \@INC, /;

                                $Modified = 1;
                        }

                        if($Line =~ m/push \@INC, /)
                        {       # If the line contains the string (push @INC, ), then replace it

                                # Replace "push @INC, " with "unshift @INC, "
                                $Line =~ s/push \@INC, /unshift \@INC, /;

                                $Modified = 1;
                        }
                }

                seek(FH, 0, 0);         # Seek to the beginning.
                print FH @ARRAY;        # Write the changed array into the file.
                close FH;                       # close the file.

                $FilesRead++;   # One more file read.

                if($Modified) {
                        print "Modified the file,  $FileToProcess\n";
                        $Modified = 0;

                        $FilesModified++;       # One more file modified.
                }
        }

        $FilesTotal++;  # One more file present.
}