Vim : An Indentation Problem

Hi all

Today a little big problem.
Every time that i copy and past every thing on vim session i have an indentation problem, for example :

1) I want copy this :

Pippo
Pluto
Paperino
Topolino

2) After a copy result is this :

Pippo
         Pluto
                Paperino
                         Topolino                 

Solution ?????
A simple "set paste" can resolve this hateful problem.

Stay tuned.

Sorting a file with pipe-delimited fields using unix sort

Hi All

Today a simple command to sort a file with pipe-delimited fields.

My file is :

EG|TW|SA|04/05/2009||
EG|NA|EN|02/05/2003||
SS|TW|SA|04/05/2009||
CD|DC|TI|30/12/2004||
ET|EG|TI|02/05/2003||
NI|SS|EN|18/02/2005||
EG|ET|TI|02/05/2003||
IN|ET|TI|21/09/2000||
SS|SS|SA|28/02/2005||
IN|PR|EN|01/11/2003||
PR|TW|SA|04/05/2009||
SS|EN|TN|18/02/2005||
EG|DC|TI|17/09/2010||
EG|EI|SA|04/08/2005||
NA|IN|SA|21/09/2000||

To sort all records by third field.

I can use these simple command :

sort -t"|" -k 3 [file_name]

Where -t is an option where u can explain field separator and with -k you can explain third field.

Stay tuned.

Women in computer science

Hi all

Today a beautiful article about women in science :
http://womenrockscience.tumblr.com/post/53348538718/hey-i-saw-a-post-that-was-credited-to-you-and-i-lost
In a field dominated by men there are and there were many women  without which the computer science would not be the same.
Bottom a beautiful picture about :

Here some wikipedia's links about these great science women :

Ada Lovelace
Hedy Lamarr
Grace Hopper

Stay tuned.

Hierarchical data in a relational database

Hi All

Today an interesting article about how represents hierarchical data in a relational database.

 http://fungus.teststation.com/~jon/treehandling/TreeHandling.htm

Interesting this concept :

Every node must have a node identify and a "Child of" identify. So the key of every object is formed by two keys :

• ID_NODE
• CHILD_OF

For example (represents image above) :

ID_NODE  CHILD_OF
1	1
2	1
3	1
4	2
5	3
6	5

Stay tuned.

How To Identify If a Port Is Listening on a Unix Server

Hi all

To see if a port is listening on a Unix Server command is :

           netstat -an | grep port number | grep LISTEN

To see what process is using a port the command is :

           lsof -i tcp:port number

Here a simple perl programm to open a port and check a connection from a client web :


#!/usr/bin/perl -w
        use IO::Socket;
        use Net::hostent;              # for OO version of gethostbyaddr
        $PORT = 8080;

        $server = IO::Socket::INET->new( Proto     => 'tcp',
                                         LocalPort => $PORT,
                                         Listen    => 5,
                                         Reuse     => 1) or die "can't setup server" unless $server;

    printf("\nSERVER Waiting for client connection on port $PORT");

         while ($client = $server->accept()) {

          printf("\nClient Connected\n");

          $client->autoflush(1);
          print $client " You are connected on port $PORT";

          close $client;
        }

Stay tuned

How check if a unix script was killed

Hi all

Today a simple mode to check if a process was killed.

It is adding at the end of your script these two rows :

...
...
...
exitvalue=$?
echo  "exit code of my program is " $exitvalue

When script ends it'll show his exit code.
For example if it was killed (kill -9) appears this message :

exit code of my program is  137

The exit code 137  is 128 + 9 so process ended for a "kill -9" command.

This is a table of HPUX Signal :


       Signal  Value    Action   Comment
       -------------------------------------------------------------------------
       SIGHUP     1             Term    Hangup detected on controlling terminal
             or death of controlling process
       SIGINT     2              Term    Interrupt from keyboard
       SIGQUIT     3              Core    Quit from keyboard
       SIGILL     4              Core    Illegal Instruction
       SIGABRT     6              Core    Abort signal from abort(3)
       SIGFPE     8              Core    Floating point exception
       SIGKILL     9              Term    Kill signal
       SIGSEGV    11     Core    Invalid memory reference
       SIGPIPE    13     Term    Broken pipe: write to pipe with no readers
       SIGALRM    14     Term    Timer signal from alarm(2)
       SIGTERM    15     Term    Termination signal



Stay Tuned.

Technology Addict

Hi all

A clear example of technology addict jejejeje.



Stay tuned