Managing users & groups since long but have you ever looked/reviewed the list of users present in a Specific Group after adding them, so here is a single line command for my lazy sysadmins :)
$ getent group | awk -F: '{print $4}'
you may use this when doing a security audit.
My latest assignment at Uttarakhand Open University is to setup a Community Radio Station (CRS) in Haldwani, we have already decided over the name and it would be known as "Hello Haldwani" we have initiated the process to get various approvals and clearances from the Ministry and have come a long way and hopefully with the current pace in next 6 months we would be on air.
In most of the systems GRUB is now upgraded to 2.0 and with this update the old restore process have also changed now there is no grub command :) available.
If you have lost the Bootloader after a routine reinstall or due to any other reason try the following to restore
Boot Using a Live CD and try the following as root
grub-setup -d /media/XXXXX/boot/grub -m /media/YYYYY/boot/grub/device.map /dev/sda
Where XXXXX represents the root partition and YYYYY represents the partition holding the /boot in case you dont have a seperate partition for /boot then XXXX and YYYY would be be the same. /dev/sda may change depending on the system you are using.
Please note this would erase the current bootloader and install a new one for you if you are unsure of what you are doing do not try this
This blog post is an HowTo "Setup SQL*Plus to work on BASH" The commands illustrated in this howto are tested on Ubuntu 9.10 with Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production Installed.
What is SQL * Plus ?
SQL*Plus is a command line SQL and PL/SQL language interface and reporting tool that ships with the Oracle Database Client and Server software. It can be used interactively or driven from scripts. SQL*Plus is frequently used by DBAs and Developers to interact with the Oracle database.
Prerequisite
Oracle Database 10g Express Edition Release 10.2.0.1.0 Installed
Once you have Oracle 10g Installed successfully you can go to
Applications > Oracle Database 10g Express Edition > Run SQL Command Line
and successfully run all your SQL PL/SQL easily but using SQL*Plus directly on BASH is the real fun, Below are the steps which will enable you to use SQL*Plus on BASH
1) set ORACLE_HOME
The IT environment today in any organization is a sort of a mixture where many different Operating Systems are used, and Windows Active Domain Controller exists in majority of such organization.
Below is a 4 step How to on "Connecting Linux (Ubuntu) Systems to Active Directory Setup"
1) Update the Software Repositories
sudo apt-get update
2) Install Required Packages (likewise-open)
sudo apt-get install likewise-open
3) Join The Domain using Domain Administrator Account, replace Administrator with Domain Administrator Username and fqdn..domain with the Fully Qualified Domain Name
sudo domainjoin-cli join fqdn.domain Administrator
4) Update the Startup Scripts
sudo update-rc.d likewise-open defaults
We always hear people saying ubuntu works well only when you have a strong internet connection as the Install CD doesn't contain all the packages required agreed now a CD cannot contain all the packages you require so you need to download the packages but there is a clear misunderstanding among new users that they always need to download these packages, Its essential to download them once but if you are reinstalling ubuntu on new machine you need not download these packages all over again if you have installed required packages on one of the machine you can use the content of below listed directory for installation
/var/cache/apt/archives
this directory contains the debian packages download by the apt-get :)
so have fun reuse the content for each install and save time and bandwidth
You had just did a weekly install of some OS which did not detected Linux, Follow the steps mentioned below to get GRUB working again. Please note this would erase the current bootloader and install a new one for you if you are unsure of what you are doing do not try this
if sudo doesnot works switch to root user and use grub drectly, Find the ROOT device you will get the values for X & Y which will be used later.
Set the root device from the information achieved from the above command
Install GRUB
Exit GRUB
Ubuntu works the apt-get way and hence makes it easy to install packages on it for confuguring Ubuntu as a DHCP server install the server software using the following command
$ sudo apt-get install dhcp3-server
this would install the required packages
after the package is installed backup the default configuration files using the following
$ sudo cp /etc/default/dhcp3-server dhcp3-server.back
dhcp3-server is a file where you specify the interface DHCP should server (wlan0 in mycase)
edit the file using
$ sudo vim /etc/default/dhcp3-server
change
INTERFACES=””
to
INTERFACES=”wlan0”
(wlan0 might be eth0 or eth1 in your case)
save and close the file
only one more file editing is required now create a backup for mail dhcpd.conf using
$ sudo cp /etc/dhcp3/dhcpd.conf /etc/dhcp3/dhcpd.conf.back
edit the file using
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