In Ubuntu, just open a terminal window and type
somebody@your-laptop:~$
This will change the wifi address, as your physical CAT 5 port is prolly eth0. The command above will change the MAC address to a random MAC address.
Sweet!
In Ubuntu, just open a terminal window and type
somebody@your-laptop:~$ sudo dhclient -r
That should drop (release) the address. To renew it…
somebody@your-laptop:~$ sudo dhclient
In Ubuntu, just open a terminal window and type
somebody@your-laptop:~$ cat /proc/cpuinfo
Compare it here.
Simples!
To copy data and a table structure in the same database, ay to backup a table, here’s the code…
CREATE TABLE new_tbl SELECT * FROM orig_tbl;
Simple as.
Good question, and an annoying one as I can never remember the command. It is..
somebody@your-laptop:~$ lsb_release -a
Sweet!
You need to know what hardware you’ve got in your Linux box?
Easy..
somebody@your-laptop:~$ sudo lshw
Job done.
One of the annoying things about MP3 apps on Linux is that, given it’s the most popular ripping format in the world (prolly), I can’t see why Linux tends not to include it as a default sound format.
I think the reason is summat to do with copyright or something? Anyway, whatever.
The solution to get MP3 support into your machine is to open a terminal and issue this command..
somebody@your-laptop:~$ sudo apt-get install gstreamer0.10-plugins-ugly-multiverse
Once installed, the MP3 option in applications appears so Sound Juicer / Rhythmbox suddenly have MP3 available – sweet!
Network ports used in conjunction with IP addresses are used to define the TCPIP socket for network connections between hosts on an (inter)network so they can communicate with each other. Some port numbers are classics and here are those used for electronic mail.
POP3 – port 110
IMAP – port 143
SMTP – port 25
HTTP – port 80
Secure SMTP (SSMTP) – port 465
Secure IMAP (IMAP4-SSL) – port 585
IMAP4 over SSL (IMAPS) – port 993
Secure POP3 (SSL-POP) – port 995
IPTABLES is the Linux firewall and it is, in short, great, The one only niggle is that sometimes you want to be able to just clear all the rules and have a nice clean firewall to fiddle with.
I found this script on the interweb and it works like a dream. To use it just do this..
1. Open a terminal window by opening the run command line with Alt + F2. Of course, if you’re using a GUI-less terminal, this doesn’t apply, just skip to step 2.
Once open, type
[codesyntax lang="bash"]
gnome-terminal
[/codesyntax]
and click OK. There’s your terminal window.
2. Now, let’s install vim, one of the common editors in Linux. Issue the command
[codesyntax lang="bash"]
user@user-machine:~$ sudo apt-get install vim
[/codesyntax]
Enter your normal login password and away you go, installing VIM in a second, job done.
3. Now let’s create the file with these commands..
[codesyntax lang="bash"]
user@user-machine:~$ cd
user@user-machine:~$ sudo vim fwflush
[/codesyntax]
to create and edit the file. Once in VIM, just cut and paste the script below into the terminal window / command line.
[codesyntax lang="bash"]
#!/bin/sh
#
# rc.flush-iptables – Resets iptables to default values.
#
# Copyright (C) 2001 Oskar Andreasson <bluefluxATkoffeinDOTnet>
#
#
# Configurations
#
IPTABLES=”/sbin/iptables”
#
# reset the default policies in the filter table.
#
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
$IPTABLES -P OUTPUT ACCEPT
#
# reset the default policies in the nat table.
#
$IPTABLES -t nat -P PREROUTING ACCEPT
$IPTABLES -t nat -P POSTROUTING ACCEPT
$IPTABLES -t nat -P OUTPUT ACCEPT
#
# reset the default policies in the mangle table.
#
$IPTABLES -t mangle -P PREROUTING ACCEPT
$IPTABLES -t mangle -P POSTROUTING ACCEPT
$IPTABLES -t mangle -P INPUT ACCEPT
$IPTABLES -t mangle -P OUTPUT ACCEPT
$IPTABLES -t mangle -P FORWARD ACCEPT
#
# flush all the rules in the filter and nat tables.
#
$IPTABLES -F
$IPTABLES -t nat -F
$IPTABLES -t mangle -F
#
# erase all chains that’s not default in filter and nat table.
#
$IPTABLES -X
$IPTABLES -t nat -X
$IPTABLES -t mangle -X
[/codesyntax]
Job done, now save it using the following key sequence in order
[codesyntax lang="bash"]
:wq
[/codesyntax]
OK, that’s the file created and ready for use – we just need to make it excecutable. Do that by issuing the chmod command thus…
[codesyntax lang="bash"]
user@user-machine:~$ chmod u+x fwflush
[/codesyntax]
4. Now run the script thus..
[codesyntax lang="bash"]
user@user-machine:~$ ./fwflush
[/codesyntax]
Now, if you issue the iptables command to show all the chains/rules, there are none but the defaults. Sweeeet!
[codesyntax lang="bash"]
user@user-machine:~$ iptables -L
[/codesyntax]