Updating time in Ubuntu

To manually update the time in ubuntu run the following command:
#sudo ntpdate ntp.ubuntu.com

This will update the time from the Ubuntu servers

Postfix enable Subject for logging

To enable logging of the "Subject:" information feature in Postfix, you need to modify the "header_checks" file in the main.cf file.

To create a file use this:
"regexp:/etc/postfix/header_checks".

main.cf entry = "header_checks = regexp:/etc/postfix/header_checks"

Once that file is created, you need to modify the file by adding:
"/^Subject:/ WARN"

This will add the Subject text to the info or mail.info log file. You can then grep based on the subject text.

SNMPwalk commands

snmpwalk -v 1|2c|3 -c public IP

example:

snmpwalk -v 2c -c public 127.0.0.1
or
snmpwalk -v 1 -c public 127.0.0.1
or
snmpwalk -v 3 -c public 127.0.0.1

Dual Monitor Config with NVidia and Ubuntu

To get dual monitors working under Ubuntu with NVidia drivers make the following changes to your xorg.conf file

Under the heading of "Screen" add the following:
Option "TwinView"
Option "1280X1024 280X1024"

Save this and restart X.

You will not have 2 monitors.

http://www.ubuntugeek.com/dual-monitors-with-nvidia.html

Sample xorg.conf after change:

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 24
Option "TwinView"
Option "1280X1024 1280X1024"
EndSection

Command line Kung-Fu

Great list of windows command line options
http://synjunkie.blogspot.com/2008/03/basic-dos-foo.html

Update firefox on Ubuntu

run the following command to enable the " check for updates" option under help:

$ gksudo firefox

Now you can update firefox under Ubuntu.

Public Free DNS servers

Thanks to http://www.tech-faq.com/public-dns-servers.shtml

Public DNS Servers

Level 3 Communications (Broomfield, CO, US)

4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6

Verizon (Reston, VA, US)

151.197.0.38
151.197.0.39
151.202.0.84
151.202.0.85
151.202.0.85
151.203.0.84
151.203.0.85
199.45.32.37
199.45.32.38
199.45.32.40
199.45.32.43

GTE (Irving, TX, US)

192.76.85.133
206.124.64.1

One Connect IP (Albuquerque, NM, US)

67.138.54.100

OpenDNS (San Francisco, CA, US)

208.67.222.222
208.67.220.220

Exetel (Sydney, AU)

220.233.167.31

VRx Network Services (New York, NY, US)

199.166.31.3

SpeakEasy (Seattle, WA, US)

66.93.87.2
216.231.41.2
216.254.95.2
64.81.45.2
64.81.111.2
64.81.127.2
64.81.79.2
64.81.159.2
66.92.64.2
66.92.224.2
66.92.159.2
64.81.79.2
64.81.159.2
64.81.127.2
64.81.45.2
216.27.175.2
66.92.159.2
66.93.87.2

Sprintlink (Overland Park, KS, US)

199.2.252.10
204.97.212.10
204.117.214.10

Cisco (San Jose, CA, US)

64.102.255.44
128.107.241.185