linux tar same folder permissions

problem
linux tar same folder permissions

solution
use -p option

linux bash for loop

the syntax that i can understand and easily remember is as follows:


for i in {1..1000}; do echo $i; done;

best debian dedicated server provider

what is the best debian dedicated server provider?

i am currently using serverbeach, but ever since peer1 bought this company, i find that they have stopped upgrading their hardware lineup for quite sometime. ie, they intel core i series never enter to their processor list.

can any one suggest any company that provides better service than serverbeach?

thanks everyone.


a debian fan (for whatever reason)

ssh without password

ssh without password

step 1

ssh-keygen -t rsa

step 2

scp ~/.ssh/id_rsa.pub user@remote:~/.ssh/authorized_keys2

note: this is to encrypt the connection with this public key and that this key is authorized for version 2 of the ssh protocol


now you can

ssh user@remote without password

step 3

cat several id_rsa.pub from many hosts, and store it as .ssh/authorized_keys2 at remote machine, you can allow many host to access the same remote host

Agent admitted failure to sign using the key

if you created a new rsa private key, you will need to update that to your system by

ssh-add

otherwise you will see this error

Agent admitted failure to sign using the key

ubuntu grub2 change default

sudo vim /etc/default/grub
sudo update-grub

vim regular expression

* matches 0 or more of the preceding characters, ranges or metacharacters
.* matches everything including empty line
\+ matches 1 or more of the preceding characters...

debian nvidia driver install

run as root
apt-get install module-assistant nvidia-kernel-common
m-a auto-install nvidia-kernel${VERSION}-source

then run the NVIDIA....run

debian disable services at startup

sudo update-rc.d -f exim4 remove

debian enable services in startup

sudo update-rc.d exim4 defaults

debian install bigmem kernel

The Bigmem Kernel

sudo apt-get install linux-image-2.6-686-bigmem


Configuring Grub


grep "Debian GNU" /boot/grub/menu.lst | nl -v0
0 title Debian GNU/Linux, kernel 2.6.18-5-k7
1 title Debian GNU/Linux, kernel 2.6.18-5-k7 (single-user mode)
2 title Debian GNU/Linux, kernel 2.6.18-5-686-bigmem
3 title Debian GNU/Linux, kernel 2.6.18-5-686-bigmem (single-user mode)
4 title Debian GNU/Linux, kernel 2.6.18-4-k7
5 title Debian GNU/Linux, kernel 2.6.18-4-k7 (single-user mode)


1. So what is the current default entry?

sudo grep ^default /boot/grub/menu.lst
default 0

2. sudo vim /boot/grub/menu.lst

debian show exim4 version number

aptitude show exim4

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as of today, 2011, feb 18, this worked like a charm

linux untar a tar ball with permissions intact

sudo tar xpzvvf file.tar.gz

linux create a tar ball with permissions intact

sudo tar cpzvvf file.tar.gz source source source

debian restore server configs

sudo rm /etc/apache2/sites-enabled/000-default
sudo cp apache2.conf /etc/apache2/apache2.conf
sudo cp hosts.conf /etc/apache2/sites-enabled
sudo cp my.cnf /etc/mysql/my.cnf
sudo cp php.ini /etc/php5/apache2/php.ini

debian backup server configs

cp /etc/apache2/apache2.conf ./apache2.conf
cp /etc/apache2/sites-enabled/hosts.conf
cp /etc/mysql/my.cnf ./my.cnf
cp /etc/php5/apache2/php.ini ./php.ini

install magento on debian apt-get install way

sudo apt-get install apache2 mysql-server php5 php5-mysql php-soap php5-mcrypt php5-curl php5-gd

GPG error on update -- public key not available

error:

W: GPG error: http://deb.opera.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A2019EA84E7532C8


reason:

pubkey expired for opera


where to look for:

sudo apt-key list

solution:
sudo apt-key del 9D1A0061
wget -O - http://deb.opera.com/archive.key | sudo apt-key add -

W: GPG error apt-get update NO_PUBKEY AED4B06F473041FA

error message:

http://security.debian.org lenny/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA

reason:
as it turns out this is because GPG key expired

This key rollover is a normal maintenance task and was started in August 2010. For security reasons Debian’s archive signing keys regularly expire after three years.

solution:
update the keys by

sudo aptitude install debian-archive-keyring

magento add custom fields in account and registration

http://www.magentocommerce.com/wiki/5_-_modules_and_development/customers_and_accounts/registration_fields

http://www.magentocommerce.com/boards/viewthread/9620/

Nikon D90 Practice

How to change DNS PTR record?

How do you change DNS PTR record? You might think that this is done by your domain registrar, such as Godaddy - after all, they point your domain to an IP address. Or you might think whoever handles your DNS would do this. But the PTR record isn't up to them, it's up to the ISP that "owns" the IP block it came from.

MySQL Access denied for user debian-sys-maint@localhost

step 1:
sudo cat /etc/mysql/debian.cnf

step 2:
[client]
host = localhost
user = debian-sys-maint
password = xxxxxxxxxxxxxxxx
socket = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
user = debian-sys-maint
password = xxxxxxxxxxxxxxxx
socket = /var/run/mysqld/mysqld.sock
basedir = /usr

step 3:
GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY 'xxxxxxxxxxxxxxxx';

javascript checking if image is fully loaded

img = new Image();
img.src = "path_to_your_image.jpg";
img.onload = function() { some_action();};