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sysadmin

8
Nov

List of Users in a Group (getent)

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.

24
Dec

Devotion to Duty

Via XKCD.com

Tags:
24
Aug

Restore GRUB 2

Restore GRUB 2

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

28
Feb

Using SQL * Plus on Command Line in Ubuntu

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

5
Feb

4 Steps to add Ubuntu Systems to Active Directory Setup

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

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