Difference between pages "Package:Irssi" and "Hostname"

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{{Ebuild
==Introduction==
|Summary=A modular textUI IRC client with IPv6 support.
A hostname is a unique name created to identify a machine on a network. In computer networking, a hostname  is a label that is assigned to a device connected to a computer network and that is used to identify the device in various forms of electronic communication such as the World Wide Web, e-mail or Usenet. Hostnames may be simple names consisting of a single word or phrase, or they may be structured.
|CatPkg=net-irc/irssi
==Configuration==
|Maintainer=
In Funtoo Linux <code>/etc/conf.d/hostname</code> is the only configuration file for setting a hostname. In OpenRC framework <code>/etc/conf.d/foo</code> is the configuration file for a corresponding Init script <code>/etc/init.d/foo</code>.  With the case of hostname, default value in <code>/etc/conf.d/hostname</code> is set to ''localhost'', means when system boots and OpenRC's <code>/etc/init.d/hostname</code> script started a hostname getting only ''localhost'' name.  How it looks?  In your shell promt this will look in following way, an example for root:
|Homepage=http://www.irssi.org/
<console>
}}
localhost ~ # ##i## Hello :)
</console>
Let's play a bit with a configuration. Open <code>/etc/conf.d/hostname</code> with your favorite editor and set a hostname of your choice. Below, I will use a real examples  from one of my working test boxes.
<console>
localhost ~ # ##i## nano /etc/conf.d/hostname
</console>
Let's set it to hostname="oleg-stable.host.funtoo.org". Save the file and restart  a hostname service:
<console>
localhost ~ # ##i## service hostname restart
</console>
Now, let's examine our changes, after a restarting a hostname
<console>
oleg-stable ~ # ##i## Hello :)
</console>
== Diving deeper==
Notice, that in above output we seeing a shortened hostname and not a FQDN (Fully Qualified Domain Name). Don't be frustrated. This is  how  default bash promt <code>PS1</code> set. To get nice promts, please, follow http://www.funtoo.org/Prompt_Magic
Another way to test our settings is using a '''hostname''' command. Here we will show only  some of it's features. Let's try to execute '''hostname''' command:
<console>
oleg-stable ~ # ##i## hostname
oleg-stable.host.funtoo.org
</console>
Now we see our fully qualified domain name hostname just how we configured it in <code>/etc/conf.d/hostname</code> in above paragraph. To get a short hostname we need to set '''-s ''' (short) argument to hostname command.
<console>
oleg-stable ~ # ##i## hostname -s
oleg-stable
</console>
Good! Hostname offers more then just displaying a system host name but can also set one. Let's try:
<console>
oleg-stable ~ # ##i## hostname foo.bar.baz
oleg-stable ~ # ##i## hostname
foo.bar.baz
</console>
As you can see, we changed a hostname on-the-fly. This is not recommended way.
{{fancywarning|Please, notice that using '''hostname''' command to configure will work temporary for a current session and will be reverted back to a value set in <code>/etc/conf.d/hostname</code> file with next system restart.}}


=== Description ===
Now that we got a brief description of a hostname and basic configuration steps, its time to reflect another important case which is directly related to a Funtoo Linux hostname generation, a hosts.
irssi is a small command line IRC client based on ncurses. It's a great thing to use when you SSH into a server, or just simply for your main IRC client.  


=== Installation ===
==Hosts case==
The install of irssi is pretty straight forward. There are not many USE flags, but one that is worth looking at is the {{c|SSL}} flag. This enables you to use SSL when connecting to servers.
As per man page <code>hosts</code> stands for static table lookup for hostnames and it's configuration file is <code>/etc/hosts</code>. Here is how it looks
{{console|body=
{{file|name=/etc/hosts|body=
###i## echo "net-irc/irssi ssl" >> /etc/portage/package.use
# Auto-generated hostname. Please do not remove this comment.
###i## emerge irssi
127.0.0.1      oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
}}
::1            oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
=== Using irssi ===
Using irssi initially can be a little intimidating if you're not used to command line programs. To first start irssi, you just simply run:
{{console|body=
$ ##i##irssi
}}
There are flags you can pass to the command line while starting irssi, such as:
{{console|body=
$ ##i##irssi -n mynick -c irc.freenode.org
}}
This would connect you to Freenode with the nick 'mynick'. Or alternatively you can just run the {{c|irssi}} command and connect via SSL if you need to:
{{file|body=
/connect -ssl irc.freenode.org
}}
This will automatically connect you over port 6697.  
 
When you have connected to the server of your choice, you can join a channel simply by:
{{file|body=
/j #funtoo
}}
If you want to leave any channel you've entered you can use the {{c|part}} command:
{{file|body=
/part #funtoo reasons...
}}
There are a few ways of navigating through your channels, you can use {{c|alt+<nowiki>{1-9}{q-p}</nowiki>}}, or alternatively you can use the {{c|window}} command that is in irssi:
{{file|body=
/window 1
/window 2
/window 3
}}
}}
For as many channels you are apart of.  
As you can see it has entries from our <code>/etc/conf.d/hostname</code>. As you may have guessed, in Funtoo Linux <code>/etc/hosts</code> file entries are auto-generated, when OpenRC hostname service starts. Previously, it is used to edit <code>/etc/hosts</code> manually. In Funtoo Linux there is no such need.


When you're ready to leave, you can simply type in:
What about custom hosts entries? This can be easily configured with 'aliases'. For example you want to have a hosts for your remote router or a computer in home LAN. Let's try to modify <code>/etc/conf.d/hostname</code> with adding following - my remote computer oleg.distant.home has an IP 10.1.1.2:
{{file|body=
<console>
/exit
oleg-stable ~ # ##i## echo 'aliases="10.1.12 oleg.distant.home"' >> /etc/conf.d/hostname
oleg-stable ~ # ##i## service hostname restart
</console>
Examine our changes:
<console>
oleg-stable ~ # ##i## cat /etc/hosts
</console>
{{file|name=/etc/hosts|body=
# Auto-generated hostname. Please do not remove this comment.
10.1.1.2        oleg.distant.home
127.0.0.1      oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
::1            oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
}}
}}
Which will close out connections to the IRC networks you've joined, and take you back to your console window.
=== Themes and scripts ===
==== Scripts ====
There are a few things you can do to make irssi look a little bit better and add some cool features. There are a few plugins that are pretty useful, such as {{c|fnotify.pl}} which is a script that utilizes {{f|libnotify}} to send you popup notifications for when your nick is pinged or you are sent a private message.
{{file|name=fnotify.pl|lang=perl|desc=fnotify.pl|body=
# todo: grap topic changes
use strict;
use vars qw($VERSION %IRSSI);
use Irssi;
$VERSION = '0.0.3';
%IRSSI = (
authors    => 'Thorsten Leemhuis',
contact    => 'fedora@leemhuis.info',
name        => 'fnotify',
description => 'Write a notification to a file that shows who is talking to you in which channel.',
url        => 'http://www.leemhuis.info/files/fnotify/',
license    => 'GNU General Public License',
changed    => '$Date: 2007-01-13 12:00:00 +0100 (Sat, 13 Jan 2007) $'
);
#--------------------------------------------------------------------
# In parts based on knotify.pl 0.1.1 by Hugo Haas
# http://larve.net/people/hugo/2005/01/knotify.pl
# which is based on osd.pl 0.3.3 by Jeroen Coekaerts, Koenraad Heijlen
# http://www.irssi.org/scripts/scripts/osd.pl
#
# Other parts based on notify.pl from Luke Macken
# http://fedora.feedjack.org/user/918/
#
#--------------------------------------------------------------------
#--------------------------------------------------------------------
# Private message parsing
#--------------------------------------------------------------------
sub priv_msg {
my ($server,$msg,$nick,$address,$target) = @_;
filewrite($nick." " .$msg );
}
#--------------------------------------------------------------------
# Printing hilight's
#--------------------------------------------------------------------
sub hilight {
    my ($dest, $text, $stripped) = @_;
    if ($dest->{level} & MSGLEVEL_HILIGHT) {
filewrite($dest->{target}. " " .$stripped );
    }
}
#--------------------------------------------------------------------
# The actual printing
#--------------------------------------------------------------------
sub filewrite {
my ($text) = @_;
# FIXME: there is probably a better way to get the irssi-dir...
        open(FILE,">>$ENV{HOME}/.irssi/fnotify");
print FILE $text . "\n";
        close (FILE);
}
Irssi::signal_add_last("message private", "priv_msg");
Irssi::signal_add_last("print text", "hilight");
#- end
}}
Another very useful script is for colored nicks, to better tell people apart. Which can be found at [http://scripts.irssi.org irssi scripts] called {{f|nickcolor.pl}}. 
When you have the scripts you would like you would put them into {{f|~/.irssi/scripts}} and set a link to {{f|~/.irssi/scripts/autorun}}.
{{console|body=
$ ##i##wget -O ~/.irssi/scripts/nickcolor.pl http://scripts.irssi.org/scripts/nickcolor.pl
$ ##i##cd ~/.irssi/scripts/autorun
$ ##i##ln -s ~/.irssi/scripts/nickcolor.pl .
$ ##i##ln -s ~/.irssi/scripts/fnotify.pl .
}}
You can do this for as many scripts as you've chosen to use. They will automatically load when you start irssi. You can also manually load scripts:
{{file|body=
/load ~/.irssi/scripts/fnotify.pl
Irssi: Loaded script fnotify
}}
Whichever works best for you is what you should do.
==== Themes ====
You can choose from many themes on the [http://irssi.org/themes irssi themes] page if you don't like the default look of it. Once you've chosen the them you like, you can simply put it in your {{f|~/.irssi/}} directory and when you run just run:
{{file|body=
/set theme mycooltheme
}}
And there you have it, the theme you have chosen is now there.
=== Conclusion ===
irssi is a great IRC client, and really helpful if you spend a lot of time in a terminal emulator or on a server.
== External Resources ==
[http://www.irssi.org/documentation Further documentation]
{{EbuildFooter}}
[[Category:IRC]]

Revision as of 16:06, February 24, 2015

Introduction

A hostname is a unique name created to identify a machine on a network. In computer networking, a hostname is a label that is assigned to a device connected to a computer network and that is used to identify the device in various forms of electronic communication such as the World Wide Web, e-mail or Usenet. Hostnames may be simple names consisting of a single word or phrase, or they may be structured.

Configuration

In Funtoo Linux /etc/conf.d/hostname is the only configuration file for setting a hostname. In OpenRC framework /etc/conf.d/foo is the configuration file for a corresponding Init script /etc/init.d/foo. With the case of hostname, default value in /etc/conf.d/hostname is set to localhost, means when system boots and OpenRC's /etc/init.d/hostname script started a hostname getting only localhost name. How it looks? In your shell promt this will look in following way, an example for root: 

localhost ~ #  Hello :)

Let's play a bit with a configuration. Open /etc/conf.d/hostname with your favorite editor and set a hostname of your choice. Below, I will use a real examples from one of my working test boxes. 

localhost ~ #  nano /etc/conf.d/hostname

Let's set it to hostname="oleg-stable.host.funtoo.org". Save the file and restart a hostname service: 

localhost ~ #  service hostname restart

Now, let's examine our changes, after a restarting a hostname 

oleg-stable ~ #  Hello :)

Diving deeper

Notice, that in above output we seeing a shortened hostname and not a FQDN (Fully Qualified Domain Name). Don't be frustrated. This is how default bash promt PS1 set. To get nice promts, please, follow http://www.funtoo.org/Prompt_Magic Another way to test our settings is using a hostname command. Here we will show only some of it's features. Let's try to execute hostname command: 

oleg-stable ~ #  hostname
oleg-stable.host.funtoo.org

Now we see our fully qualified domain name hostname just how we configured it in /etc/conf.d/hostname in above paragraph. To get a short hostname we need to set -s (short) argument to hostname command. 

oleg-stable ~ #  hostname -s
oleg-stable

Good! Hostname offers more then just displaying a system host name but can also set one. Let's try: 

oleg-stable ~ #  hostname foo.bar.baz
oleg-stable ~ #  hostname 
foo.bar.baz

As you can see, we changed a hostname on-the-fly. This is not recommended way.

   Warning

Please, notice that using hostname command to configure will work temporary for a current session and will be reverted back to a value set in /etc/conf.d/hostname file with next system restart.

Now that we got a brief description of a hostname and basic configuration steps, its time to reflect another important case which is directly related to a Funtoo Linux hostname generation, a hosts.

Hosts case

As per man page hosts stands for static table lookup for hostnames and it's configuration file is /etc/hosts. Here is how it looks

   /etc/hosts 
# Auto-generated hostname. Please do not remove this comment.
127.0.0.1       oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
::1             oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain

As you can see it has entries from our /etc/conf.d/hostname. As you may have guessed, in Funtoo Linux /etc/hosts file entries are auto-generated, when OpenRC hostname service starts. Previously, it is used to edit /etc/hosts manually. In Funtoo Linux there is no such need.

What about custom hosts entries? This can be easily configured with 'aliases'. For example you want to have a hosts for your remote router or a computer in home LAN. Let's try to modify /etc/conf.d/hostname with adding following - my remote computer oleg.distant.home has an IP 10.1.1.2: 

oleg-stable ~ #  echo 'aliases="10.1.12 oleg.distant.home"' >> /etc/conf.d/hostname
oleg-stable ~ #  service hostname restart

Examine our changes:

oleg-stable ~ #  cat /etc/hosts
   /etc/hosts 
# Auto-generated hostname. Please do not remove this comment.
10.1.1.2        oleg.distant.home
127.0.0.1       oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
::1             oleg-stable.host.funtoo.org oleg-stable localhost localhost.localdomain
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