A utility to emulate MS-Dos's tree command that I wrote while in college while learning Perl. Caution, may launch all the nukes.

vtree.pl

#!/usr/bin/perl

# FILE          :   vtree
# AUTHOR        :   Nicholas Perry
# EMAIL         :   nperry@morning.ecet.vtc.edu (defunct)
# DATE CREATED  :   03/08/2005
# DATE MODIFIED :   N/A
# DESCRIPTION   :   Perl: Recursively finds and displays the filetree.
print "\n<INIT: '$0'>\n";
# BEGIN CODE HERE.

# Start command line argument parse.

# Set Defaults.
$showall = "standard";

# Get Args.
foreach(@ARGV){
    if($_ eq "--out" && !defined $fileout) # Open output file
    {
	open (FILEOUT,">vtreelist.txt")
	    or die "error outputting to vtreelist.txt";
	$fileout = "true";
    }
    
    if($_ eq "--hide"){
	$showall = "hidemode";
    }
    if($_ eq "--all"){
	$showall = "allmode";
    }
    if($_ eq "--help"){
	if(defined $fileout){
	    close FILEOUT;
	}
	print "usage:\n";
	print "  --out creates a file vtreelist.txt\n";
	print "  --hide hides \# and ~ backup files\n";
	print "  --all shows hidden files aswell\n";
     	exit();
    }
}

# Verbose.
print "(writing to vtreelist.txt)\n" if(defined $fileout);
print "(diplay mode = \"$showall\")\n";


# Clean up.
shift @ARGV while($ARGV[0] =~ /^--/);
# End command line argument parse.



$depth = 0; # This doesn't really do anything, but it helped while debugging.

if($ARGV[0] =~ /~\//)
{
    &listdir("$ARGV[0]",""); # Pass ARGV[0] since it is a full path.
} else {
    &listdir("./$ARGV[0]",""); # Add a ./ because it is relational based.
}

# Warning, Recursive!
sub listdir {
    my $curdir = $_[0]; # Get current directory.
    shift @_;  # Remove current directory from list.
    my @position; # Stores what to print in front of filename.
    push @position,@_; # Place rest of crap onto position, initially nothing.
    my @files; # List of files in current directory.
    my @unsortfiles; # Temporary list of files to be sorted into @files.
    my $numfiles = 0; # Number of file in current directory being processed.
    my $totfiles = 0; # Total number of files in current directory.
    
    # Get list of files from directory.
    if($showall eq "allmode")
    {
	open ( FILE_LIST , "/bin/ls -a $curdir |") 
	    or die "ls did not open for \"$dir\" at:";
    } else {
	open ( FILE_LIST , "/bin/ls $curdir |") 
	    or die "ls did not open for \"$dir\" at:";
    }
    @unsortfiles = <FILE_LIST>;
    chomp @unsortfiles;
    
    
    # Sort folders to be done last in current directory.
    foreach (@unsortfiles)
    {
	if ($_ ne "." && $_ ne "..")
	{
	    if( $showall ne "hidemode" ||
		$_ !~ m/^\#/ &&
		$_ !~ m/\~$/ )
	    {		
		if(-d "$curdir/$_")
		{ # If its a directory.
		    push @files, $_; # Put on end.
		} else {
		    unshift @files, $_; # Else put on beggining.
		}
		$totfiles++;
	    }
	}
    }
    
    
    
    push @position, " +---"; # Add standard file pointer line to offset files.
    
    foreach(@files)
    { # for each file in directory.
	
	$numfiles++;
	if($numfiles == $totfiles)
	{
	    pop @position;
	    push @position," \\---"; # Replace standard pointer with ender. 
	}
	
	if(-d "$curdir/$_")
	{ # If its a directory.
	    push @position,"[d]"; # Temp append the directory tag.
	    # Display line with file. 
	    print FILEOUT join(/""/,@position),"$_\n";
	    print join(/""/,@position),"$_\n"; 
	    pop @position;
	} else {
	    # Display line with file.
	    print FILEOUT join(/""/,@position),"$_\n";
	    print join(/""/,@position),"$_\n";
	}
	
	
	
	if(-d "$curdir/$_"){ # If its a directory.
	    
	    $depth++;
	    pop @position; # Remove file pointer.
	    
	    if($numfiles == $totfiles)  # Pad end of pointer.
	    {
		push @position, "     "; # Use if ended current directory.
	    } else {
		push @position, " |   "; # Use if not ended.
	    }
	    
	    &listdir("$curdir/$_",@position); # Go down directory. (RECURSIVE)
	    
	    pop @position;
	    push @position, " +---"; # Restore file pointer 
	    $depth--;
	}
	
    }
    
    if($fileout eq "true"){
	close FILE_LIST;
    }
   
}
    
    
    
    
# END CODE HERE.
print "<END>\n\n";