====== Useful Scripts ======

Below are a random selection of scripts for a random set of tasks! They are written in different languages and in some cases are operating system dependent.

To download a script you can just click on the file name above the code (note some scripts only have a downloadable version).

===== File Utilities ===== 

==== Multiple File Diff ====

|**Description:**|Diffs all files within two directories, using underlying 'diff' tool.|
|**Language:**|Perl|
|**Example:**|//perl diffallfiles.pl source/directory target/directory// |
<file perl diffallfiles.pl>
# S.Chudley (www.chudley.me) : Diff all files between two directory structures

my %l_src = ();
my %l_dst = ();
&list_files($ARGV[0], \%l_src);
&list_files($ARGV[1], \%l_dst);

foreach my $l_file (sort keys %l_src)
{
   print "$l_file: ";
   if (defined $l_dst{$l_file})
   {
      my @l_results = `diff \"$ARGV[0]\\$l_file\" \"$ARGV[1]\\$l_file\"`;
      if ($? != 0)
      {
         print "\n\n";
         foreach my $l_line (@l_results) { print "   ".$l_line; }
         print "\n";
      }
      else { print "No change.\n"; }
   }
   else { print "Not found in target directory.\n"; }
}

foreach my $l_file (sort keys %l_dst)
{
   if (!defined $l_src{$l_file})
   {
      print "$l_file: Not found in source directory.\n";
   }
}

sub list_files
{
   local ($a_dir, *a_list) = @_;
   chomp(my @l_files = `dir /B \"$a_dir\"`);
   foreach my $l_name (@l_files)
   {
      my $l_file = $a_dir."\\".$l_name;
      if (-f $l_file)
      {
         my $l_path = $ARGV[1];
         $l_path =~ s/\\/\\\\/g;
         if ($l_file =~ /^$l_path/)
         { $l_file =~ s/^$l_path\\//; }
         else
         {
            $l_path = $ARGV[0];
            $l_path =~ s/\\/\\\\/g;
            $l_file =~ s/^$l_path\\//;
         }

         $l_file =~ s/^\.\\//;
         $a_list{$l_file} = 1;
      }
      elsif (-d $l_file) { &list_files($l_file); }
   }
}
</file>

----

==== File System Fill Up ====

|**Description:**|Script to fill up a drive, leaving a given number of bytes free.|
|**Language:**|Perl|
|**Example:**|//perl fillup.pl 1024768//|
<file perl fillup.pl>
# S.Chudley (www.chudley.me) : Script to fill up a drive, leaving a given number of bytes free
my $leave = $ARGV[0];
if ($leave eq "")
{
    print "Specify amount of space to leave (as bytes).\n";
    exit(1);
}

print "Filling buffer...\n";
$block_size = 1024 * 1024;
my $data_buffer = "";
for (my $i=0;$i!=$block_size;$i++) { $data_buffer .= " "; }

if ($leave >=  2000 * $block_size)
{
    print "Can't leave more than ".(2000 * $block_size / 1024)." kb free!\n";
    exit(1);
}

my $free_space = &get_free();
print "Drive has ".($free_space/1024)." kb free...\n";

if ($free_space >= 2097152000)
{
    print "Making a big file (2048 MB) called file.big...";
    &make_file("file.big", 2000 * $block_size);
    print " Done.\n";
}

$free_space = &get_free();
print "Drive now has ".($free_space/1024)." kb free...\n";

if ($free_space <= $leave)
{
    print "Arn't $leave bytes free anyway!\n";
    exit(1);
}

my $multi = int($free_space / (2000 * $block_size));
print "Spinning out $multi copies of this file (total ".(2000 * 1024 * $multi)." kb)...\n";

for (my $i=0;$i!=$multi;$i++)
{
    `copy file.big file.$i.big`;
    if ($? != 0)
    {
        print "Oops? File write failed?\n";
        exit(1);
    }
    my $pc = ($i / $multi) * 100;
    $pc = substr($pc, 0, 5);
    print "  Created ".($i + 1)." files [".$pc." %]\n";
}

$free_space = &get_free();
print "Drive now has ".($free_space/1024)." kb free...\n";

my $remains = $free_space - $leave;
print "Consuming up remaining ".($remains / 1024)." kbs... ";
&make_file("remaining.big", $remains);
print "Done\n";

$free_space = &get_free();
print "Drive now has ".($free_space/1024)." kb free...\n";
if ($free_space ne $leave)
{
    print "Erm? Something went wrong\n";
    exit(1);
}

exit(0);

sub make_file
{
   my ($name, $size) = @_;
   open(OUT,">$name") or die "Can't create file '$name'!\n";

   my $done = 0;
   my $blocks = int($size / $block_size);
   while ($done < ($blocks * $block_size)) { print OUT $data_buffer or die "Oops? Write failed in make_file()?"; $done += $block_size; }
   for (my $i=$done;$i!=$size;$i++) { print OUT " " or die "Oops? Write failed in make_file()?"; }
   close(OUT);
}


sub get_free
{
    my @free_txt = `dir /-C`;
    my $free = 0;
    foreach (@free_txt) { if ($_ =~ m/\s+([0-9,]+)\s+bytes\s+free/) { $free = $1; $free =~ s/,//g; } }
    return $free;
}
</file>

----

==== For Each File ====

|**Description:**|Executes a passed command on every file within a target directory. |
|**Language:**|Perl|
|**Example:**|//perl foreachfile.pl c:\scratch *.bmp gzip FILE//|
<file perl foreach_file.pl>
# S.Chudley (www.chudley.me) : Executes a passed command on every file within a target directory
my $l_dir = $ARGV[0];
my $l_ext = $ARGV[1];
my $l_cmd = "";
for (my $i = 2; $i < @ARGV;$i++) { $l_cmd .= " ".$ARGV[$i]; }
if ($l_dir eq "" or $l_cmd eq "" or $l_cmd !~ /FILE/)
{
   print "foreach_file <source_dir> <extension> <command>\n";
   print "\nWhere <command> contains one of more occurence of FILE, which will be replaced by the file being processed.\n";
   exit(1);
}
chdir($l_dir);
foreach (`dir $l_ext /B`)  # For Windows
# foreach (`ls $l_ext -1`) # For Linux
{
   chomp;
   my $l_loc_cmd = $l_cmd;
   $l_loc_cmd =~ s/FILE/$_/g;
   print `$l_loc_cmd`;
}
</file>

----

==== Lock File ====

|**Description:**|Lock a file exclusively for read/write.|
|**Language:**|Perl|
|**Example:**|//perl lockit.pl TheFile.txt//|
<file perl lockit.pl>
# S.Chudley (www.chudley.me) : Lock a file
use Fcntl qw (:flock);
my $file = $ARGV[0];
if (! -f $file) { print "Can't find '$file'\n"; exit(1); }
open(FILE, ">>$file");
flock(FILE, 2);
print "Type something and hit enter to unlock: ";
<STDIN>;
close(FILE);
</file>

----

==== Modify File Access Time ====
|**Description:**|Modifies the file last access time.|
|**Language:**|Perl|
|**Example:**|//perl mod_file_access_time.pl file.txt//|
<file perl mod_file_access_time.pl>
# S.Chudley (www.chudley.me) : Modify file access time
use Time::Local;
$when = timegm(0,0,10,12,8,10);
utime $when, $when, $ARGV[0];
</file>

----

==== Screwup a File ====

|**Description:**|Corrupts a file by writing random bytes into it.|
|**Language:**|Perl|
|**Example:**|//perl screwup.pl UnluckyFile.txt//|
<file perl screwup.pl>
# S.Chudley (www.chudley.me) : Corrupt a file

my $file = $ARGV[0];
if (! -f $file)
{
    print "Can't find '$file'\n";
    exit(1);
}

my $size = (stat($file))[7];
open(INF, "+>".$file) or die "Can't open '$file' for writing!";
binmode INF;

my $k = $size / 1000;
for (my $i = 1;$i != 1000;$i++)
{
    my $pos = int($k * $i);
    &blat($pos);
}

close(INF);

sub blat
{
    my $pos = shift;
    seek INF, $pos, 0;
    print INF "\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255\255";
}
</file>


===== Programming Utilities ===== 

==== C++ Line Count ====

|**Description:**|Count number of lines in C++ app, where files end cc, c, hh or h.|
|**Language:**|Perl (Windows)|
|**Example:**|//perl line_count.pl//|
<file perl line_count.pl>
# S.Chudley (www.chudley.me) : Count number of lines in C++ app, where files end cc|c|hh|h
my $l_extensions = "cc|c|hh|h|cpp|hpp";
my $l_count = 0;

&count_dir(".");
sub count_dir
{
   my $a_path = shift;
   chomp(my @l_files = `dir /B $a_path`);
   foreach my $l_name (@l_files)
   {
      my $l_file = $a_path."\\".$l_name;
      if (-f $l_file and $l_file =~ m/\.($l_extensions)$/i)
      {
         my $l_c = 0;
         open(INF, $l_file);
         while (my $l_line = <INF>)
         {
            if ($l_line !~ m/^\s*\/\// and
                $l_line !~ m/^\s*\*/ and
                $l_line !~ m/^\s*\/\*/ and
                $l_line !~ m/^\s*#/ and
                $l_line !~ m/^\s*$/) { $l_c++; }
         }
         close(INF);
         $l_file =~ s/^\.\\//;
         print $l_file.": ".$l_c."\n";
         $l_count += $l_c;
      }
      elsif (-d $l_file) { &count_dir($l_file); }
   }
}

print "\nTotal: $l_count\n";
</file>

----

==== Nuke Tabs in Source ====

|**Description:**|Replaces all tabs with spaces within all cc, c , hh or h files within a given directory recursively.|
|**Language:**|Perl (Windows)|
|**Example:**|//perl nuketabs.pl//|
<file perl nuketabs.pl>
# S.Chudley (www.chudley.me) : Replace tabs with spaces in source code
my $l_extensions = "cc|c|hh|h";

&do_dir(".");
sub do_dir
{
   my $a_path = shift;
   chomp(my @l_files = `dir /B $a_path`);
   foreach my $l_name (@l_files)
   {
      my $l_file = $a_path."\\".$l_name;
      if (-f $l_file and $l_file =~ m/\.($l_extensions)$/)
      {
         my $l_tfile = $l_file.".tmp";
         print "Processing $l_file...\n";
         open(INF, $l_file);
         open(OUTF, ">".$l_tfile);
         while (my $l_line = <INF>)
         {
            if ($l_line !~ m/^\s*\/\// and
                $l_line !~ m/^\s*\*/ and
                $l_line !~ m/^\s*\/\*/ and
                $l_line !~ m/^\s*#/ and
                $l_line !~ m/^\s*$/) { $l_line =~ s/\t/    /g; }
             print OUTF $l_line;
         }
         close(OUTF);
         close(INF);
         `copy $l_tfile $l_file`;
         if ($? != 0) { die "Failure with copy on $l_tfile to $l_file!"; }
         `del $l_tfile`;
         if ($? != 0) { die "Failure to delete $l_tfile!"; }
      }
      elsif (-d $l_file) { &do_dir($l_file); }
   }
}
</file>



===== Windows System Control =====

==== Adjust Windows Volume ====

|**Description:**|Allows you to set the master Windows volume via a script.|
|**Language:**|VBScript|
|**Example:**|//adjust_windows_volume.vbs//|
<file vb adjust_windows_volume.vbs>
'S.Chudley (www.chudley.me) : Set Windows master volume (hAE = DOWN, hAF = UP)
Set WshShell = CreateObject("WScript.Shell")
For i=1 To 100
  WshShell.SendKeys(chr(&hAE))
Next
</file>

----

==== Toggles Windows Mute ====

|**Description:**|Toggels the master mute setting on Windows.|
|**Language:**|VBScript|
|**Example:**|//toggle_mute_windows_volume.vbs//|
<file vb toggle_mute_windows_volume.vbs>
'S.Chudley (www.chudley.me) : Toggels Windows master mute
set oShell = CreateObject("WScript.Shell")
oShell.run"Sndvol32"
WScript.Sleep 1500
oShell.SendKeys"{TAB 2} "
oShell.SendKeys"%{F4}"
</file>

===== Windows Utilities =====

==== Perl In a Batch ====

|**Description:**|How to run Perl embedded into a DOS batch file.|
|**Language:**|DOS Batch|
|**Example:**|//perl_in_a_batch.bat//|

<file dos perl_in_a_batch.bat>
@echo off
REM S.Chudley (www.chudley.me) : Embed Perl into a batch script

echo Now we're in a batch file
perl -x -S %0 %*
goto endofperl

@rem ';
#!/perl

print "Now we're in a Perl script - type something... ";
chomp(my $a = <STDIN>);
print "You typed '$a'\n";

__END__
:endofperl

echo Now we're back in a batch file!
</file>