You need to define the shell variables as follows:

HTTP_PROXY={YOUR-PROXY-Server-IP-HERE}:{YOUR-PROXY-SERVER-Port-Here}
FTP_PROXY={YOUR-PROXY-Server-IP-HERE}:{YOUR-PROXY-SERVER-Port-Here}

You can put above two directives in a file called ~/.wgetrc:

echo 'HTTP_PROXY=192.168.1.254:3128'>> ~/.wgetrc
echo 'FTP_PROXY=192.168.1.254:3128'>> ~/.wgetrc

Now you can use wget:
$ wget http://example.com/file.tar.gz
You can also define shell variables as follows:
export http_proxy=http://192.168.1.254:3128/
OR you can pass the proxy username and password as follows:
wget --proxy-user=YOUR-USERNAME-HERE --proxy-password=YOUR-PASSWORD-HERE http://nixcraft.com/file.tar.gz

You can use gmail as a smart host to send all messages from your Linux / UNIX desktop systems. You need to use a simple program called ssmtp. It accepts a mail stream on standard input with recipients specified on the command line and synchronously forwards the message to the mail transfer agent of a mailhub for the mailhub MTA to process. Failed messages are placed in dead.letter in the sender’s home directory.

Install ssmtp

Type the following command under CentOS / RHEL / Red Hat / Fedora Linux:
# yum install ssmtp
Type the following command under Debian / Ubuntu Linux:
# apt-get update && apt-get install ssmtp

Configure gmail as a smarthost

Open /etc/ssmtp/ssmtp.conf, enter:
# vi /etc/ssmtp/ssmtp.conf
Update file with the following settings:

AuthUser=vivek@gmail.com
AuthPass=Your-Gmail-Password
FromLineOverride=YES
mailhub=smtp.gmail.com:587
UseSTARTTLS=YES

Also, make sure you disable Sendmail:
# service sendmail stop
# chkconfig sendmail off
# mkdir /root/.bakup
# mv /usr/sbin/sendmail /root/.bakup
# ln -s /usr/sbin/ssmtp /usr/sbin/sendmail
Now, you can use mail / mailx command to send email messages. You can also write a shell script to backup your files and email to somewhere else (see below). You can test settings using following syntax:
$ echo "This is a test" | mail -s "Test" vivek@nixcraft.co.in

A note about sSMTP

sSMTP works well for desktop systems, but it is not a replacement for Sendmail / Postfix / Exim / Qmail for email server environment. This software is perfect for a single user system.

use Net::SMTP::TLS;
my $mailer = new Net::SMTP::TLS(
‘smtp.gmail.com’,
Hello => ‘smtp.gmail.com’,
Port => 587,
User => ‘username’,
Password=> ‘password’);
$mailer->mail(‘from@domain.com’);
$mailer->to(‘to@domain.com’);
$mailer->data;
$mailer->datasend(“Sent from perl!”);
$mailer->dataend;
$mailer->quit;

Let’s not hesitate and look at few usage examples… Want to know what’s the latest version of a particular kernel-tree?

$ ketchup -s 2.6

2.6.17.7

$ ketchup -s 2.6-mm

2.6.18-rc1-mm2

Let’s play with your kernel sources a bit. First of all, you surely want to check what version you currently got lying around…

$ cd /usr/src/linux

$ ketchup -m

2.6.17.6

Let’s assume there is a newer kernel version available and you want to download it, bunzip it, revert the old patch and apply the new one. Nothing easier than that:

# cd /usr/src/linux

# ketchup 2.6-tip

2.6.17.6 -> 2.6.17.7

Applying patch-2.6.17.6.bz2 -R

Applying patch-2.6.17.7.bz2

That’s really it. It will download the patches, revert and apply them, so all you will have to do is watch and wait

Switching to an entirely different kernel versions is just as easy:

# cd /usr/src/linux

# ketchup 2.6.16.2

Final note: If Ketchup should abort with a gpg error, then it couldn’t verify the patch’s or kernel’s signature. Either add the 2.6 public key to your keyring (this is the proper solution) or call Ketchup with an additional -G parameter (this will override signature checking). I’d suggest the former, which is really easy to do by downloading it from a public pgp server:

# gpg --keyserver wwwkeys.pgp.net --recv-keys 0x517D0F0E

Have fun compiling,

Since there are alot of people asking for it, here is my HowTo about mod_ruid2
This is based on my CentOS server with Apache 2.x.

Installing this module its no longer needed to chmod config files to 666 or upload/attachments directories to 777. Since with this module enabled everything @ HTTP will run under the user itself and not ‘apache’ anymore.

** If you are using mod_ruid instead of mod_ruid2, first of all remove the mod_ruid line from ‘/etc/httpd/conf/httpd.conf‘

First, we are going to install libcap-devel
yum -y install libcap-devel
After this is done we are going to download and install mod_ruid2
wget http://dave.t0xic.nl/tars/mod_ruid2-0.9.tar.bz2
tar xjf mod_ruid2-0.9.tar.bz2
cd mod_ruid2-0.9
apxs -a -i -l cap -c mod_ruid2.c

Now, if you didn’t get any errors mod_ruid2 should be installed and added to the ‘/etc/httpd/conf/httpd.conf‘.
Lets confirm mod_ruid2 is added
grep 'mod_ruid2' /etc/httpd/conf/httpd.conf
If you get any response like below its installed

LoadModule ruid2_module /usr/lib/apache/mod_ruid2.so

Now we need to modify the DA httpd.conf templates a little bit to enable mod_ruid2 for the users

Now copy the template files to custom
cd /usr/local/directadmin/data/templates/
cp virtual_host2* custom/
chown -R diradmin:diradmin custom/

Now you have copied the original templates to the ‘custom’ directory, so they won’t be overwritten.

Now follow the steps below for each virtual_host2 file you’ve copied
nano -w virtual_host2.conf

## replace line: SuexecUserGroup |USER| |GROUP|
## replace with: #SuexecUserGroup |USER| |GROUP|
## Add the lines below under the just replaced line
RMode config
RUidGid |USER| |GROUP|
RGroups apache

Save the files and lets rewrite the HTTPd config files
echo "action=rewrite&value=httpd" >> /usr/local/directadmin/data/task.queue

If you want you can start the rewrite of the HTTPd config files manually, just paste the line below and wait when its done
/usr/local/directadmin/dataskq d800
After the rewrite is complete you can restart HTTPd with the command below
/etc/init.d/httpd restart
Now mod_ruid2 should be installed and you don’t need to chmod anymore like ‘chmod 666 config.php’ or ‘chmod 777 uploads’.

To be sure the webmail clients etc still works we need to change the owner permissions
chown -R webapps:webapps /var/www/html

** Questions with Answers **
——————————————————-
Q: How can I test this is working?
A: Easy, install some CMS that you are used before. Like WordPress, Joomla that required (before!!) chmod 666 or 777 to get install/working.

Q: I’ve dirs/files owned by apache for some users, must I change this?
A: Yes, you need to give the dirs/files owner of the user itself, not apache anymore. Check below
Thanks for snk for the commands below, to fix the owner permissions of the dirs/files

cd /usr/local/directadmin/scripts && ./set_permissions.sh user_homes
find /home/*/domains/*/public_html -type d -print0 | xargs -0 chmod 711
find /home/*/domains/*/public_html -type f -print0 | xargs -0 chmod 644
cd /usr/local/directadmin/data/users && for i in `ls`; do { chown -R $i:$i /home/$i/domains/*/public_html;}; done;

* Added ‘&&’ so if they do a typo, it won’t change anything.

You are missing a question, or you have a question, please let me know and I’ll try to answer them for you!