User since: Apr 29, 2003 at 07:28 UTC (22 years ago) Last here: Mar 06, 2024 at 09:01 UTC (1 year ago) Experience: 7292 Level: Parson (16) Writeups: 952 Location: (near) Aix-La-Chappell, Germany User's localtime: Mar 24, 2025 at 15:04 CET Scratchpad: View For this user: Search nodes

The image was created using South Park Studio and Gimp.

I was introduced to the monastry by physi. He was my boss in a project.

I picked my name from Robert Asprin's books about M.Y.T.H. Inc. which I really love.

Useful Character Set information: [https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/]

perlmonk nodes I often use:

• DBI recipes
• Yes, even you can use CPAN
• Chatterbox FAQ
• What shortcuts can I use ...
• New Link Tags
• cbhistory
• Friar
• tree command
• Configuration Files and Template::Toolkit2

My perl skeleton

#!/usr/bin/perl
use strict;
use warnings;

use Getopt::Long qw(:config no_ignore_case);

use Pod::Usage;

my ( # options
    $verbose,
    $debug,
    $file,
    @columns,
);

$file= 'default.txt';

help() unless GetOptions(
    'v'          => \$verbose,
    'verbose!'   => \$verbose,
    'debug+'     => \$debug,
    'file=s'     => \$file,
    'c|column=i' => \@columns,
    'h|help'     => \&help,
    'm|man'      => \&man,
);

sub help { pod2usage(-verbose=>1); }
sub man  { pod2usage(-verbose=>2); }

print "OKAY\n";

# Program goes here...

=head1 NAME

Getopt::Long / Pod::Usage skeleton

=head1 SYNOPSIS

skeleton.pl [options]

=head1 DES‎CRIP‎TION

This is a skeleton I use when creating a new perl s‎crip‎t

=head1 OPTIONS

=over 4

=item B<-v>

verbose outoput

=item B<-d>

=item B<-debug>

debug mode

=item B<-file> F<filename>

specify the file to work with

=back

=head1 BUGS

none yet

=head1 TODO

much

=cut
[download]

• mkdir -p

  use File::Basename;
  mkdir_p("some/long/path");
  sub mkdir_p {
      return ((-d $_[0]) or (mkdir_p(dirname $_[0]) and mkdir $_[0], 075
  +5));
  }
  [download]

• IP v4 address manipulations

  #!/usr/bin/perl
  use strict;
  use warnings;
  use Socket;
  
  my $ifconfig='/usr/sbin/ifconfig';
  
  # run ifconfig -a
  open my $if, '-|', "$ifconfig -a" or die "Couldn't run $ifconfig: $!\n
  +";
  while (<$if>) {
          # find a line with "broadcast" in it
          # on Solaris this contains all the information I need
          next unless /inet\s+(.*?)\s+netmask\s+(.*?)\s+broadcast\s+(.*?
  +)\s*$/;
  
          # keep ip address as it is (a dotted string)
          my $iaddr= $1;
  
          # convert the netmask to a "long"
          my $netmsk= hex "0x$2";
  
          # dito for the broadcast
          my $brdcst= unpack 'N', inet_aton $3;
  
          # How many bits does the netmask have?
          my $bits= 31-int(log(0xffffffff ^ $netmsk)/log(2));
  
          # Convert the netmask to a "slashed" IP
          my $network= inet_ntoa(pack "N", ($brdcst & $netmsk)) . "/" . 
  +$bits;
  
          # show all info found
          print "$iaddr\t$network\n";
  }
  close $if;
  [download]

• Reverse DNS Lookup
  

  use Socket;
  my ($name,$aliases,$addrtype,$length,@addrs) = gethostbyaddr(inet_aton
  +("74.125.79.94"));
  print $name,$/;
  [download]

• Building perl on Solaris with gcc
  • make sure /usr/ccs/bin is not in the path
  • make sure make is in the path for "make test" e.g. by

    ln -s /usr/ccs/bin/make /usr/local/bin
    [download]

• Building perl DBI (on Solaris) with gcc

  perl Makefile.PL CC=gcc LD=gcc CCCDLFLAGS=-fPIC OPTIMIZE=-O3
  [download]

  This is not necessary if you build your own perl as above in which case the normal process will work.
• Building DBD::mySQL ...
  make sure .../mysql/bin is in your path
• CSV splitting without modules
  

  sub csvsplit {
      my (@result);
      for ($_[0]) {
          s/[\015\012]+$//;
          while (s/^"((?:[^"\\]|\\.)*)"// || s/^'((?:[^'\\]|\\.)*)'// ||
  + s/^([^,]*)//) {
              push(@result, $1);
              last unless s/^,//;
          }
      }
      return @result;
  }
  [download]

bit-vec for more than 31 bits.

my $vec = [];

sub setBit {
    my($vec, $offset, $val)= @_;
    my $index= $offset >> 31;
    my $subset= $offset & 0x7fffffff;
    $vec->[$index]||='';
    vec($vec->[$index], $subset, 1)= ($val & 1);
}

sub getBit {
    my($vec, $offset)= @_;
    my $index= $offset >> 31;
    my $subset= $offset & 0x7fffffff;
    $vec->[$index]||='';
    return vec($vec->[$index], $subset, 1);
}
[download]