Linux User and Group Administration Commands:

1) How to add user in linux.

The syntax is as follows:
# adduser username
# useradd username

2) How to delete user in linux.

#userdel username

3) How to set password for a user in linux.

#passwd username

4) How to lock user account in Linux.

The syntax is as follows:
#passwd -l {username}

5) How to unlock user account in Linux.

#passwd -u {username}

6) How to create group in linux.

The syntax is as follows:
# groupadd  group name

7)How to add user to group

.
# useradd -G group name  username

8) What is UID for root user.

#  id root
uid=0(root) gid=0(root) groups=0(root)

9) How to check os version in linux.

# cat /etc/redhat-release
#cat /proc/version

10) How to check free disk space in linux.
#df -h
 

Useful Commands for Windows Administrators:-

DIR                       ---  List of files and directory.
DIR /aa                 ---  List of files and directories
tree                        ---  List folder path.
cd                          ---  Change directories
mkdir                    ---  Make/Create directories
md                        ---  Make/Create directories
ASSIGN              ---  Create a file or link directory
rmdir                    ---  Remove an existing directory
rd                          ---  Remove an existing directory
chdir                     ---  Present working directory.
del                        ---  Delete the directory or file.
erase                     ---  Delete the directory or file.
copy                     ---  Copy the contents from directory.
type                      ---  Displays contents of a file on the screen  
cls                        ---  Clears the terminal screen.
rename                 ---  Rename directory or file.
REN                     ---  Rename a file
date                      ---  Shows current date and time of system.
move                    ---  Move to directory or file from one location to other.
comp                    ---  Compare two files and show differences.
set variable           ---  Set environmental variables
echo                     ---  Print the same output which we gave in input
print                     ---  Give a print for a file
reboot                  ---  Reboot the system.
hostname             ---  It display a hostname of computer
ping                     ---  ping is intended for use in network testing, measurement, and management.
tracert                  ---  The tracert command is used to show details about the path that a packet takes to a specified destination.
ipconfig               ---  Displays information about network interface.
route print            ---  It print routing table
net share              ---  shows mounted partition of OS.
systeminfo           ---  show system information(OS type, arch, mem info)
ver                       ---  shows version of Operating System.
taskkill                ---  Kills the specified processes
format                 ---  Formats a disk to accept DOS files(Pen drives or HDD)
doskey /h            ---  Display the history of commands.
help or commands /? -- Displays information about a command.

Basic Exim Commands:

Check the mail logs through following command:

[root@test  ~]# cat /var/log/exim_mainlog | grep domainname.com

To see sent mail log view /var/log/maillog file.

You can see messages that are in the postfix queue.

[root@test  ~]# mailq

-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------

Count the number of messages in the queue on the server use following command
.
[root@test  ~]# exim -bpc

 Listing the messages in the queue (time queued, size, message-id, sender, recipient).

[root@test  ~]# exim -bp

Print a summary of messages in the queue (count, volume, oldest, newest, domain, and totals).

[root@test  ~]# exim -bp | exiqsumm

Check what Exim is doing right now.

[root@test  ~]# exiwhat

How to install IIS 8.0 on Windows Server 2012? Go through the following simple steps:

To install IIS 8.0 on Windows 2012 follow the steps below:

1. Open Server Manager.
2. Under Manage menu, select the option Add Roles and Features.
3. Select Role-based OR Feature-based Installation.
4. Select the appropriate server option (local option selected by default)
5. Then select Web Server IIS (Internet Information Server/Service)
6. Default no additional features are needed to run IIS (If you required any then you can choose it as per your requirement)
7. Click on Next:
8. Customize your installation of IIS, or accept the default settings that have already been selected for you, and then click Next:
9. Click on Install option.
10. When the IIS installation completes, the wizard reflects the installation status.
11. After complete installation click on Close to exit the wizard.

Database Servers

Database and database related workloads are key components of the business

processing that takes place on Itanium2 based servers.These systems leverage 64-

bit processing to speed database performance, moving large data sets and out

of memory and directly addressing multi-gigabyte segments of the database at

once.

WHAT IS DATABASE?

Database is normally known as a collection of information organized in such a

way that a computer program can quickly select desired pieces of data.You

can think a database as an electronic filling system.

TYPES OF DATABASE

There are a lot of database servers in the market right now and these are a few

examples of it…

• ORACLE

Oracle Corporation is one of the major companies developing

database management systems (DBMS), tools for database development,

middle-tier software, enterprise resource planning software (ERP),

customer relationship management software (CRM) and

supply chain management (SCM) software.

• MICROSOFT SQL

Microsoft SQL Server is a relational database management system

(RDBMS) produced by Microsoft. Its primary query language is Transact-SQL, an

implementation of the ANSI/ISO standard Structured Query Language (SQL)

used by both Microsoft and Sybase.

• MYSQL

MySQL is a multithreaded, multi-user, SQL Database Management System

(DBMS) with more than six million installations. MySQL AB makes MySQL Server

available as free software.

Important service ports no:

Port No.     20         FTP-Data   ( FTP Data )
Port No.     21         FTP           ( FTP connection)
Port No.     22         SSH
Port No.     25         SMTP
Port No.     53         DNS
Port No.     80         HTTP
Port No.    110        POP3
Port No.    143        IMAP
Port No.    443        HTTPS
Port No.   3306       MySQL
Port No.   8443       Plesk Panel (with SSL)
Port No.   8880       Plesk Panel
Port No.   2082      cPanel
Port No    2083      cPanel (with SSL)
Port No.   2086      WHM
Port No.   2087      WHM (with SSL)
Port No.   2095      Webmail
Port No.   2096      Webmail (with SSL)
Port No.   1433       MSSQL
Port No.   3389.      RDP
Port No.   23           Telnet
Port No.   80           IIS

Follow the below steps to configure outlook 2007:

(1) Open Microsoft Outlook 2007. From the Tools menu, select Account Settings.
(2) Click New.
(3) Enter Your Name, E-mail Address, Password, and password confirmation
(4) At the bottom, select Manually configure server settings or additional server
types and click Next.
(5) Select Internet E-mail, and click Next.
(6) Enter Your Name and full E-mail Address.
(7) Select either IMAP or POP3 for your Account Type. Use these settings for your
incoming and outgoing servers, depending on the type of email you have:
**POP3
Incoming mail server : pop.gmail.com
Outgoing mail server (SMTP) : smtpout.gmail.com
** IMAP
Incoming mail server : imap.gmail.com
Outgoing mail server (SMTP) : smtpout.gmail.com.
(8) Enter your User Name (your full email address) and Password, and select
Remember password.
(9) Click More Settings.
(10) Click the Outgoing Server tab. Select My outgoing server (SMTP) requires
authentication and Use same settings as my incoming server.
(11) Select the Advanced tab.
(12) Next to Outgoing Server (SMTP), type 80. Then, click OK.
(13) Click Next, and then click Finish.