Showing posts with label Basic Computer. Show all posts
Showing posts with label Basic Computer. Show all posts

Free Download Computer Fundamental Books PDF in Bengali

Free Download Computer Fundamental Books PDF in Bengali, Free Download Bengali Computer Fundamental Books PDF , Download Free Computer Fundamental Books PDF in Bengali Language , PDF Computer Fundamental Books Free, Free PDF of Computer Fundamental Books in Bengali.
Today computer is a very important part of every students. So in this post we are going to share some basic computer books in bengali Language as PDF file. If you want to know about computer, then you can download this book. This book is also very important for the computer students and teacher. The book is written by Tanbir Ahmed who one of the good content writer and famous person in Bangladesh. We are forever grateful to him for writing these books. In this book, the beginner will find easy learning computer in a bengali language that helps the learner very fast. I think this book will very helpful for all computer students.
Computer Fundamental Books

Because when we go to buy such books from market, buy these with high price. Keep in mind as the links are external, so there sometime may error. Don't worry, if there occurs any downloading problem, our team will come quick forward to help you. 

Download Link:

We are very grateful to Tanbir Ahmed who offers those books free for us. May God bless him. I think you will never get from any market.
So, Please comment in comment box for query and don't forget to share such valuable books to your friends.

What is the Full Form of CPU ? CPU Full Form

Full Form of CPU | Full Forms of CPU | All  CPU Full Forms | 50 CPU Full Form | All CPU Full Form

Central Processing Unit    >>   Hardware

Core Processing Unit    >>   Hardware
Computer Parts Unlimited    >>   Stock Exchange
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What is the Full Form of CPU ? CPU Full Form


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Basic Computer Knowledge Questions and Answer

Today, In this post share some Basic-Computer-Knowledge Questions and Answer , i hope that this question and answer help you for any competitive exam.

Question and answers

1) The improvement of computer hardware theory is summarized by which law.? A.) Metcalf’s law     B.) Bill’s Law
C.) Grove’s law     D.) Moore’s First Law

  • Answer: Option 'D'
  • Moore’s First Law
2) The most widely used computer device is.
A.) Solid state disks     B.) External hard disk
C.) Internal hard disk    D.) Mouse

  • Answer: Option 'C'
  • Internal hard disk

3)  _______ are software which is used to do particular task.
A.) Operating system     B.) Program
C.) Data     D.) Software

Answer: Option 'B'

4)  Who is father of modern computers?
A.) Abraham Lincoln     B.) James Gosling
C.) Charles Babbage    D.) Gordon E. Moore

  • Answer: Option 'C'
  • Charles Babbage

5) How many generations of computers we have?
A.) 6    B.) 7
C.) 5     D.) 4

  • Answer: Option 'C'
  • 5
6) ________ controls the way in which the computer system functions and provides a means by which users can interact with the computer.
A.) The operating system    B.) The motherboard
C.) The platform     D.) Application software

  • Answer: Option 'A'
  • The operating system

7) All of the following are examples of real security and privacy risks EXCEPT:
A.) Viruses    B.) Hackers
C.) Spam     D.) Identity theft.

  • Answer: Option 'C'
  • Spam

8) The term 'Pentium' is related to
A.) DVD    B.) Hard Disk
C.) Microprocessor     D.) Mouse

  • Answer: Option 'C'
  • Microprocessor

10) What does HTTP stands for?
A.) Head Tail Transfer Protocol    B.) Hypertext Transfer Protocol
C.) Hypertext Transfer Plotter     D.) Hypertext Transfer Plot
  •  Answer: Option 'B'
  • Hypertext Transfer Protocol

Rename More Files With a single Hits No software ! No Coding !!

Rename more files quickly and very Easy
Friends, If you have Two or more than Two files with unrecognizable names then you can change their names at once in a sequence. 
For example you have a folder containing 100 files of songs with different names and you want to arrange them by giving names “song1”, “song2”, “song3” …..etc, then follow these 
Rename More Files With a single Hits No software ! No Coding !!
Instractions :
  1. First of all open the folder containing files.
  2.  Press CTRL+A to Select all files. ( If you want to select or rename particular files then  press and hold “CTRL” key and then click different files to select. )
  3.  Open file menu and click rename or right click on any selected file and click rename.
  4.  Now type the new name you want and press enter.
  5. If you type “song”, the first name will be “song” and the remaining files will be named      “song1”, “song2”, “song3” …. so on.
  6. Try it now and save your time. 
Enjoy !!!

Most Useable Advanced linux commands for quick system analysis

Linux or, less frequently used, is a Unix-like and mostly POSIX-compliant computer operating system assembled under the model of free and open-source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on 5 October 1991 by Linus Torvalds. The Free Software Foundation uses the name GNU/Linux to describe the operating system, which has led to some controversy.
In this post discuss Most Useable advensed Linux commands for linux operating system user which helps in many ways . If you are not linux administrator then these commands can help you in many ways .
Most Useable Advanced linux commands for quick system analysis

Following commands are very important .

  • ifconfig
  • netsat
  • nslookup
  • who
  • w
  • who am i
  • whoami
  • uptime
  • wall
  • top
  • rsync
  • lsof
  • find 
  • whereis 
  • alias
  • unalias
  • df
  • su
  • diff
  • traceroute
  • iostat
  • mpstat
  • iftop

ifconfig :- 

this command is used to setup network details . Also we can see ip address of the system . there are many uses of this command . complete usage of this command can be seen use command  "man ifconfig " .
some uses of that commands are :-
ifconfig -a   --> will show all details of networks 
ifconfig eth0 --> will show details of fist ethernet network
 ifconfig eth0 down --> will take first ethernet down  or shutdown ethernet first
 ifconfig eth0  up -->  just opposite to the down command . it will start firsth ethernet
ifconfig eth0  netmask -->  will set system ip to and netmast to

netstat :-

 netstat is very important command to use on servers . it shows details about all port activities . which port are working and how many connections on the ports at any time . complete usage of this command can be seen using command "man netstat" .
Some uses of this commands are :-
netstat -a --> will show all port activities
netstat -at --> will show all TCP port activities
netstat -au --> will show all UDP port activities
netstat -l --> ports which are listening
netstat -tl --> TCP ports which are listening
netstat -s --> statistics for all ports
netstat -st --> statistics for alls TCP ports only
netstat -n --> will show hosts in numeric form i.e. in ip address forms
netstat -c --> continuously

use many commands combinations to get your desired results . like :-
netstat -atn | grep ":8080 "  --> it will show connections on only 8080 port
 netstat -tan | grep ':80 ' | awk '{print $6}' | sort | uniq -c
1884 FIN_WAIT1

nslookup :-

this command is used to see dns entries of any domain or ip . like
nslookup --> it wil show details about , its ip and max available info
nslookup --> will show details about this ip address
nslookup --> will show details of from dns

 traceroute :-

this command is used to trace route between your system to destination . use :-
traceroute --> will show all nodes of connectivity between your system and servers .

iostat :-

this command is used to get all input and output statistics over all hard disks. to install this command in system use  "yum install sysstat " .uses :-
iostat --> will show average of input and output operation on every disk partition .
iostat 2 --> will show continuously current io statistics .


mpstat shows output stats of every processor available .
mpstat , mpstat -P all --> will how all processors statistics .
mpstat -P 0 --> will show just first processor output statistics .

uptime :-

it will show uptime of your server . that means from how much time your server is running . This will reset after restart of server . to use it just write uptime in shell and hit enter

wall :-

this command is used to send a message to all shells of that system . Suppose many people are logged in on that server . If any one want to convey any message to all people then use wall .like :-
wall "dont delete anyfile from directory /home/parveen" --> the message will appear to every one logged in the server

w,who,whoami ,who am i :-

these three commands will provide you details about how many user are logged in the system and from how much time .
w --> will show details of all logged in users .
who -- > similar to w but show less details .
whoami --> will show you your username .
who am i --> will show you more details about your login .

top :-

top is most basic and mostly used command . it can provide complete overview of your system . This will show CPU usage , RAM usage , load on system ,which process is using maximum system .etc .

htop :-

slightly modified version of top command . It show use individually of every CPU .

rsync :- 

this command is used to make two directoris in sync with each other . This can be used over two different systems or on the same system itself .

rsynch -uar /home/parveen/   /home/backup/ --> this will send all updated file from /home/parveen/ directory to /home/backup directory .
rsync --rsh='ssh -p22' -aur root@    /home/parveen/images/ --> this command will get all files from different machine to current machine .

lsof :- 

it will provide list of open files . there are many uses of this command . like :-
lsof --> list all opened files on the system
lsof /home/parveen/parveen.log --> will show open statistics for specific file  /home/parveen/parveen.log
lsof +D  /home/parveen/  --> will show files open under directory /home/parveen/
lsof -u root --> will show files opened by user root .
lsof -p 10 --> will specify opened file by specific process .i.e process id 10 .

find :- 

this command is used to search any file in the system .this can be used like that :-
find /home/ -name abc.txt --> this command will try to search file abc.txt under directory /home/ .
find / -name abc.txt --> this command will find abc.txt in the whole system .
find . -name abc.txt --> this command will find abc.txt in the current directory .

whereis :-

this command will search the location of commands . like:-
whereis cp --> will show the location of cp command . This may also search is binary files .

alias :-

this command is used to create aliasing for any command. this command is helping to create shortcuts of commands .like :-
alias pp="ls -lhtr" --> after this if you run pp command this it will show results equivalent to ls -lhtr


this command will remove the alias created .like:-
unalias pp --> now pp will no longer be any alias .

df :-

this command is used to show storage usage of all hard disk partitions . like :-
df -k --> this will show all partitions witgh there usage and free memory available in bits.
df -kh --> this will show size in MB KB and GB format .

du :-

this command is used to show disk usage by directories and files . this can be used in maby ways .
du --> will show directories which are using some space that means files which are non empty .
du -a --> this comamnd will show all files . also will show empty files
du -ah --> will show memory in human readle form like KB MB GB .
du -s --> will show summarised memory .
du -sh * --> will show memory taken by all files and directory at your current location with human readable form .


this command is used to find difference between two files . for comparison of two files this is well structured command .
diff file1 file2 --> will print differences between this two files  .

Useful Important Symbols For MS Office like as Word Excel etc... !

Useful Symbols For MS Office ! On previous post i share How to Test Your Internet Speed ? now, in this post share some important symbol for MS Word, Excel, etc. These important Symbols can be used in MS Word, Excel, etc. To read Bengali version about this tropic visit computer tips and tricks world.

Useful Symbols For MS Office like as Word Excel etc...  !
 Read- How to Remove BIOS Password one minute !!! Without Software

These important Symbols

  • For © : Alt+0169
  • For ® : Alt+0174 
  • For ™ : Alt+0153
  • For › : Alt+0155 
  • For : Alt+0134
  • For ΓΈ : Alt+0248 
  • For ¤ : Alt+0164
  • For « : Alt+0171 
  • For ° : Alt+0176 
  • For ± : Alt+0177 
  • For ² : Alt+0178 
  • For ³ : Alt+0179 
  • For Β΅ : Alt+0181 
  • For ¶ : Alt+0182 
  • For ¹ : Alt+0185 
  • For » : Alt+0187
  • For ¼ : Alt+0188 
  • For ½ : Alt+0189 
  • For ¾ : Alt+0190 
  • For Γ… : Alt+0197 
  • For × : Alt+0215 
  • For Ø : Alt+0216
  •  For Þ : Alt+0222
  •  For ß : Alt+0223
  •  For ☺: Alt+1

Numeral system -Binary, Octal, Decimal, Hex Decimal

Numeral system

A numeral system (or system of numeration) is a writing system for expressing numbers, that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. It can be seen as the context that allows the symbols "11" to be interpreted as the binary symbol for three, the decimal symbol for eleven, or a symbol for other numbers in different bases.
Read Bengali version click here....
The number the numeral represents is called its value.

Ideally, a numeral system will:

    Represent a useful set of numbers (e.g. all integers, or rational numbers)
    Give every number represented a unique representation (or at least a standard representation)
    Reflect the algebraic and arithmetic structure of the numbers.

For example, the usual decimal representation of whole numbers gives every non zero whole number a unique representation as a finite sequence of digits, beginning by a non-zero digit. However, when decimal representation is used for the rational or real numbers, such numbers in general have an infinite number of representations, for example 2.31 can also be written as 2.310, 2.3100000, 2.309999999..., etc., all of which have the same meaning except for some scientific and other contexts where greater precision is implied by a larger number of figures shown.

Numeral systems are sometimes called number systems, but that name is ambiguous, as it could refer to different systems of numbers, such as the system of real numbers, the system of complex numbers, the system of p-adic numbers, etc. Such systems are not the topic of this article. Reed More .....

Type of Number System

  • Binary Numeral System
  • Octal Numeral System
  • Decimal Numeral System
  • Hex Decimal Numeral System

Numeral System

b - numeral system base
dn - the n-th digit
n - can start from negative number if the number has a fraction part.
N+1 - the number of digits

Binary Numeral System - Base-2

Binary numbers uses only 0 and 1 digits.
B denotes binary prefix.


101012 = 10101B = 1×24+0×23+1×22+0×21+1×20 = 16+4+1= 21
101112 = 10111B = 1×24+0×23+1×22+1×21+1×20 = 16+4+2+1= 23
1000112 = 100011B = 1×25+0×24+0×23+0×22+1×21+1×20 =32+2+1= 35

Octal Numeral System - Base-8

Octal numbers uses digits from 0..7.


278 = 2×81+7×80 = 16+7 = 23
308 = 3×81+0×80 = 24
43078 = 4×83+3×82+0×81+7×80= 2247

Decimal Numeral System - Base-10

Decimal numbers uses digits from 0..9.
These are the regular numbers that we use.


253810 = 2×103+5×102+3×101+8×100

Hexadecimal Numeral System - Base-16

Hex numbers uses digits from 0..9 and A..F.
H denotes hex prefix.


2816 = 28H = 2×161+8×160 = 40
2F16 = 2FH = 2×161+15×160 = 47
BC1216 = BC12H = 11×163+12×162+1×161+2×160= 48146

Number System Conversion Table 

Number System Conversion Table

 Number syetem Base and Digit

 Number syetem Base and Digit


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