Re: Good Resource (book) for RegEx
Hi From my experience after reading what has been suggested is to try and do some real examples which test you knowledge to the limit. What is the difference between a Basic Regular Expression and an Extended Regular Expression ? When you think you know, try putting together a 30 minute talk explaining them which you can give to your dog,cat,parrot, your Mother,Granmother, etc. Explain they will get bored but you will learn about your gaps in your knowledge. I recently did something similar to test my knowledge. -- Andrew in Edinburgh,Scotland On Wed, 3 Dec 2008, Stealth wrote: On Wednesday 03 December 2008 10:46:21 am Rex wrote: In order to ramp up quickly on the nitty-gritty of Regular Expressions in Perl, what will be a good book to start with? I do have moderate familiarity with RegEx, but am still not using all that Perl's RegEx engine has to offer. Hence the question. Thanks, Rex Look at the perldoc on regex and get a copy of Mastering Regular Expressions by Friedl second or third edition. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: not understanding pipe command
Hi Richard, Richard wrote: while going over below example from the book, I am not understanding why/how below program works. Can someone explain this to me in better way? Have you tried running it? does it work like what you expect? what is READER exactly reading from??? and what does print while READER do ? I thought all the print happens during factorial() and fibonacci() It is reading from a pipe. Take a look at the description of the pipe function and what a pipe is (in case you do not know): http://perldoc.perl.org/functions/pipe.html http://en.wikipedia.org/wiki/Pipe_(Unix) is reading in from the pipe. Take a look at: http://perldoc.perl.org/perlop.html#I%2fO-Operators So, while there is something left to read, print it out. Go to the above link and look at the first shaded box which says The following lines are equivalent. The line that is confusing you is the last line in that box...as it says, all of those are equivalent. to answer your last question, then, the answer is no, the printing isn't happening in just the two functions you named. Take a look at the above links to see if they give you a clue. And if you are wondering what the select line is doing, take a look at this and look up the select function: http://perldoc.perl.org/perlfaq5.html#How-do-I-flush%2funbuffer-an-output-filehandle%3f--Why-must-I-do-this%3f And BTW, you can cut out almost half of the code if you just focus on either fibonacci or factorial and not both. Ray -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Not getting all the element.
slow == slow leaner [EMAIL PROTECTED] writes:
slow while (@numbers){
Meta question: Did you see this combination of @... on a web page or book
somewhere, and if so, where? Or did you construct this through some thought
process, and if so, can you explain it?
I keep seeing this bad meme crop up from time to time, and I'd like to follow
it upstream to see how to prevent this sort of derailing.
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Re: not understanding pipe command
Raymond Wan wrote: Hi Richard, Richard wrote: while going over below example from the book, I am not understanding why/how below program works. Can someone explain this to me in better way? Have you tried running it? does it work like what you expect? what is READER exactly reading from??? and what does print while READER do ? I thought all the print happens during factorial() and fibonacci() It is reading from a pipe. Take a look at the description of the pipe function and what a pipe is (in case you do not know): http://perldoc.perl.org/functions/pipe.html http://en.wikipedia.org/wiki/Pipe_(Unix) is reading in from the pipe. Take a look at: http://perldoc.perl.org/perlop.html#I%2fO-Operators So, while there is something left to read, print it out. Go to the above link and look at the first shaded box which says The following lines are equivalent. The line that is confusing you is the last line in that box...as it says, all of those are equivalent. to answer your last question, then, the answer is no, the printing isn't happening in just the two functions you named. Take a look at the above links to see if they give you a clue. And if you are wondering what the select line is doing, take a look at this and look up the select function: http://perldoc.perl.org/perlfaq5.html#How-do-I-flush%2funbuffer-an-output-filehandle%3f--Why-must-I-do-this%3f And BTW, you can cut out almost half of the code if you just focus on either fibonacci or factorial and not both. Ray thanks!! I will study them and let you know. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
issue command once connected IRC
I am trying to write a script that will connect to an IRC channel and check
if the server is a botnet cc server. I have found several templates for
connecting to irc, but they all rely on the MOTD to confirm connectivity.
The problem is often botnets do not set up commands such as MOTD and LUSERS.
I would like to connect to the suspected ip and then issue a few commands
such as LUSER, LIST, WHO, STATS and MOTD, then exit. I am having trouble
finding a reference that discusses how to do this. Most of what I have seen
is for legite IRC, which has the script connect, join a channel and then do
a trival task. Can someone help me modify or point me to a good example of
how to accomplish this?
Here is my IRC subroutine that allows me to connect and then does nothing:
sub irc {
# create the IRC object
my $irc = new Net::IRC;
print (Creating connection to IRC server...);
my $conn = $irc-newconn(Server = $ip,
Port = $port,
Nick = jsxpiid,
Ircname = habvhgdjba,
Username = hvbcsrcx)
or die (Can't connect to IRC server.);
print (Connected\n);
# action to take once connected
sub on_connect {
my $self = shift;
print *** Connected to IRC.\n;
}
# print any output data while connected
sub on_init {
my ($self, $event) = @_;
my (@args) = ($event-args);
shift (@args);
print *** @args\n;
}
# handle what happens when receiving public (channel) text.
sub on_public {
my ($self, $event) = @_;
my @to = $event-to;
my ($nick, $mynick) = ($event-nick, $self-nick); # Sender
text,
+Bot nick
my $host=$event-host; # Sender's hostname
my ($arg) = ($event-args); # The message
# parse the channel text
print $nick $arg\n;
}
# handles what happens when receiving private message text
sub on_msg {
my ($self, $event) = @_;
my ($nick) = $event-nick; # Message Sender
my ($arg) = ($event-args); # Message Text
my $host=$event-host;
# Here's where we want to parse message text
print - $nick - $arg\n;
}
# use if nick is taken, setting it to an alternate nick.
sub on_nick_taken {
my ($self) = shift;
$self-nick(fxcvbynru);
}
# install handler subs
print (Installing local handlers...);
$conn-add_handler('public', \on_public);
$conn-add_handler('msg',\on_msg);
print (Completed\n);
print (Installing global handlers...);
$conn-add_global_handler([ 251,252,253,254,302,255 ], \on_init);
$conn-add_global_handler(376, \on_connect);
$conn-add_global_handler(433, \on_nick_taken);
print (Completed\n);
# start irc connection
$irc-start;
}
# end irc subroutine
Re: issue command once connected IRC
Seems I was a little too hasty. I was able to change the numerical values
the code was using in connecting to get what I wanted. Now I just need to
figure out how to disconnect once successfully connected. Please let me know
if anyone has any ideas about how I should accomplish this. Thanks
On Fri, Dec 5, 2008 at 12:15 AM, blake askew [EMAIL PROTECTED] wrote:
I am trying to write a script that will connect to an IRC channel and check
if the server is a botnet cc server. I have found several templates for
connecting to irc, but they all rely on the MOTD to confirm connectivity.
The problem is often botnets do not set up commands such as MOTD and LUSERS.
I would like to connect to the suspected ip and then issue a few commands
such as LUSER, LIST, WHO, STATS and MOTD, then exit. I am having trouble
finding a reference that discusses how to do this. Most of what I have seen
is for legite IRC, which has the script connect, join a channel and then do
a trival task. Can someone help me modify or point me to a good example of
how to accomplish this?
Here is my IRC subroutine that allows me to connect and then does nothing:
sub irc {
# create the IRC object
my $irc = new Net::IRC;
print (Creating connection to IRC server...);
my $conn = $irc-newconn(Server = $ip,
Port = $port,
Nick = jsxpiid,
Ircname = habvhgdjba,
Username = hvbcsrcx)
or die (Can't connect to IRC server.);
print (Connected\n);
# action to take once connected
sub on_connect {
my $self = shift;
print *** Connected to IRC.\n;
}
# print any output data while connected
sub on_init {
my ($self, $event) = @_;
my (@args) = ($event-args);
shift (@args);
print *** @args\n;
}
# handle what happens when receiving public (channel) text.
sub on_public {
my ($self, $event) = @_;
my @to = $event-to;
my ($nick, $mynick) = ($event-nick, $self-nick); # Sender
text,
+Bot nick
my $host=$event-host; # Sender's hostname
my ($arg) = ($event-args); # The message
# parse the channel text
print $nick $arg\n;
}
# handles what happens when receiving private message text
sub on_msg {
my ($self, $event) = @_;
my ($nick) = $event-nick; # Message Sender
my ($arg) = ($event-args); # Message Text
my $host=$event-host;
# Here's where we want to parse message text
print - $nick - $arg\n;
}
# use if nick is taken, setting it to an alternate nick.
sub on_nick_taken {
my ($self) = shift;
$self-nick(fxcvbynru);
}
# install handler subs
print (Installing local handlers...);
$conn-add_handler('public', \on_public);
$conn-add_handler('msg',\on_msg);
print (Completed\n);
print (Installing global handlers...);
$conn-add_global_handler([ 251,252,253,254,302,255 ], \on_init);
$conn-add_global_handler(376, \on_connect);
$conn-add_global_handler(433, \on_nick_taken);
print (Completed\n);
# start irc connection
$irc-start;
}
# end irc subroutine
