cp lab ii lab manual
TRANSCRIPT
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WHAT IS UNIX
UNIX is an operating system which was developed first in the
1960s and has under constant development ever since by operating
system we mean the suite of programs which make the computer work.
It is a stable, multi-user, multi-tasking operating system for servers,
desktops and laptops.
UNIX operating system also have graphical user interface
(GUI) similar to Microsoft windows operating system which provides
an easy to environment. However knowledge of unix is required for
operations which are not covered by graphical program or for when
there is no windows interface available.
TYPES OF UNIX
There are many different versions of unix, although they share
the common similarities. The most popular varieties of unix are Sun
Solaris, GNU/Linux and Macos X.
THE UNIX OPERATING SYSTEM
The Unix Operating system is made up of three parts
1.
The Kernel2. The Shell3. The Programs
THE KERNEL
The Kernel of Unix is the hub of the operating system. It
allocates time and memory to programs and handles the file store and
communication in response to system calls.
As an illustration of the way that the shell and the kernel work
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The shell scratches the filestore for the file containing the program
rm. And then requests the kernel, through system calls to rm myfile
finished running, the shell then returns the unix prompt % to the user,
indicating execute the program rm on myfile. When the process that
i t is waiting for future commands.
THE SHELL
The shell acts as an interface between the user and the
kernel. When user login, the login program checks the username and
password, and then starts another program called the shell. The shell is
a command line interpreter (CLI). It interprets the commands the user
types in an arranges for them to be carried out. The commands are
themselves programs. When they terminate, the shell gives the user
another prompt (% on our system). By typing part of the name of a
command, filename and directory and pressing the [tab] key, the shell
will complete the rest of them automatically. If shell finds more than
one name beginning with those letters you have typed, it will beep,
prompting to type a few more letters before pressing the tab key again.
The shell keeps the list of the commands you have typed
in, if you need to repeat a command, use the cursor key to scroll up and
down the list or type history for a list of previous commands. Different
users may use different shells. Initially, your system administrator will
supply a default shell , which can be overridden or changed.
The most commonly available shells are:
Bourne shell (sh) C shell (csh) Korn shell (ksh) TC Shell (tcsh) Bourne Again Shell (bash)Each shell also includes its own programming language. Command
files, called "shell scripts" are used to accomplish a series of tasks.
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editing file maintenance printing sorting programming support online info
Modular: single functions can be grouped to perform more complex
tasks.
The Bourne shell is one of the oldest shells and is the most efficient for
background work. However it provides few facilit ies for interactive
users.
The C shell provides sophisticated interactive capabilities lacking in
the Bourne shell. Features of this shell include a command history
buffer, command aliases and file name completion. The C shell has a
syntax which resembles the C programming language.
The C shell is the default shell for interactive work on many UNIX
systems. It will be covered in this document, although most of the
basic commands given here are relatively standard across all the main
shells.
The Korn shell was written by David Korn from AT&T and in it he
attempted to merge the preferred features of both the Bourne and C
shells as well as adding some additional features.
Unfortunately the Korn shell was not available for free, as other UNIX
shells were, so many users and companies did not chose to use of it .
The Bash shell was based on the Bourne shell (Bourne again shell) and
as with Korn it attempted to combine the best features of the othershells which were available at the time. This shell however was
available for free. Bash was initially adopted for LINUX although
several varieties of LINUX now exist e.g. RedHat, SuSE and Debian-
GNU.
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A file is collection of datas. They are created by users using text
editors, running, compilers etc.
Examples of files
Document The text of a program written in some high level language.All files are grouped together in the directory structure. The file system
is arranged in a hierarchical structure, l ike inverted tree. The top of the
hierarchy is traditionally called root (written [/] slash)
FEATURES OF UNIX
1. MultitaskingMultitasking is the capability of the operating system to perform
various tasks simultaneously. I .e. A single user can run multiple
programs (tasks) concurrently.
2. Multi-user CapabilityMulti-user capability of UNIX allows several users to use the
same computer to perform their tasks. Several terminals (keyboards and
monitors) are connected to a single powerful computer (Unix server)
and each user can work with their terminals.
3. SecurityUnix allows sharing of data. Every user must have a login name
and a password. So, accessing another user s data is impossible withoutpermission.
I.e. Invalid users cannot access data.
4. PortabilityUNIX is portable because it is written in a high level language.
So, UNIX can be run on different computers.
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o Between the different terminals connected to the UNIXserver.
o Between the users of one computer to the users of anothercomputer located elsewhere in the network.
6. Programming facilityUNIX is highly programmable, the UNIX shell programming
language has all necessary ingredients like conditional and control
structure (Loops) and variables, that establish it as a programming
language in its own right.
ADVANTAGES OF U NIX
UNIX is a very stable operating system. UNIX supports the Multi-User feature. UNIX is a Multitasking operating system. UNIX can be loaded to any type of computer hardware. UNIX is optimized for program development. UNIX has rich set of small commands and utili t ies that do
specific tasks.
UNIX has a powerful unified file system, everything in a filedata, program and all physical devices.
UNIX has the ability to string commands and utili t ies together inunlimited ways to accomplish more complicated tasks.
UNIX allows only authorized users to modify files anddirectories.
UNIX allows only System Administrators to make changes inSystem Configuration files.
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RESULT:Thus study of unix operating system was complete.
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Ex. No: 1.2 BASIC UNIX COMMANDS
DATE:
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Aim
To study and execute Unix commands.
Unix is security conscious, and can be used only by those persons who have an
account. Telnet (Telephone Network) is a Terminal emulator program for TCP/IP
networks that enables users to log on to remote servers.
To logon, type telnet server_ipaddress in run
window.
User has to authenticate himself by providing username and password. Once
verified, a greeting and $ prompt appears. The shell is now ready to receivecommands from the user. Options suffixed with a hyphen () and arguments are
separated by space.
General commands
Command Functiondate Used to display the current system date and time.date +%D Displays date onlydate +%T Dis la s time onl
date +% Y Displays the year part of datedate +% H Displays the hour part of timecal Calendar of the current monthcalyear Displays calendar for all months of the specified yearcalmonth year Displays calendar for the specified month of the yearwho Login details of all users such as their IP, Terminal No, User name,who am i Used to display the login details of the usertty Used to display the terminal nameuname Displays the Operating Systemunamer Shows version number of the OS (kernel).unamen Displays domain name of the server
echo "txt" Dis la s the iven text on the screenecho $HOME Displays the user's home directorybc Basic calculator. Press Ctrl+d to quitlpfile Allows the user to spool a job along with others in a print queue.
mancmdname Manual for the given command. Press q to exithistory To display the commands used by the user since log on.exit Exit from a process. If shell is the only process then logs out
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Directory commands
Command Functionpwd Path of the present working directorymkdirdir A directory is created in the given name under the currentmkdirdir1 dir2 A number of sub-directories can be created under one stroke
cdsubdir Change Directory. If the subdir starts with / then path starts
cd To switch to the home directory.cd / To switch to the root directory.
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Command Functioncd .. To move back to the parent directoryrmdirsubdir Removes an empty sub-directory.
File commands
Command Functioncat >filename To create a file with some contents. To end typing press
catfilename Displays the file contents.
cat >>filename Used to append contents to a file
cpsrc des Copy files to given location. If already exists, it will be
cpi src des Warns the user prior to overwriting the destination filecpr src des Copies the entire directory, all its sub-directories and files.
mv old new To rename an existing file or directory. i option can also bemvf1 f2 f3 dir To move a group of files to a directory.
mvv old new Display name of each file as it is moved.
rmfile Used to delete a file or group of files. i option can also be usedrm * To delete all the files in the directory.rmr * Deletes all files and sub-directoriesrmf * To forcibly remove even write-protected filesls Lists all files and subdirectories (blue colored) in sortedlsname To check whether a file or directory exists.lsname* Short-hand notation to list out filenames of a specific pattern.lsa Lists all files including hidden files (files beginning with .)lsxdirname To have specific listing of a directory.lsR Recursive listing of all files in the subdirectorieslsl Long listing showing file access rights (read/write/execute-
cmpfile1 file2 Used to compare two files. Displays nothing if files are
wcfile It produces a statistics of lines (l), words(w), and characters(c).
chmodperm file Changes permission for the specified file. (r=4, w=2, x=1)
chmod 740 file sets all rights for user, read only for groups
The commands can be combined using the pipeline (|) operator. For example,number of users logged in can be obtained as.
who | wc -l
Finally to terminate the unix session execute the command exit or logout.
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[vijai@localhost vijai]$ date
Sat Apr 9 13:03:47 IST 2011
[vijai@localhost vijai]$ date +%D
04/09/11
[vijai@localhost vijai]$ date +%T
13:05:33
[vijai@localhost vijai]$ date +%Y
2011
[vijai@localhost vijai]$ date +%H
13
[vijai@localhost vijai]$ cal
April 2011
Su Mo Tu We Th Fr Sa
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
[vijai@localhost vijai]$ cal 08 1998
August 1998
Su Mo Tu We Th Fr Sa
1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31
mailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhost -
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[vijai@localhost vijai]$ cal 1800
1800
January February March
Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa
1 2 3 4 1 1
5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8
12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15
19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22
26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29
30 31
October
November December
Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa
1 2 3 4 1 1 2 3 4 5 6
5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13
12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17 18 19 2019 20 21 22 23 24 25 16 17 18 19 20 21 22 21 22 23 24 25 26 2726 27 28 29 30 31 23 24 25 26 27 28 29 28 29 30 31
30
[vijai@localhost vijai]$ who
root :0 Apr 9 08:41
vijai pts/0 Apr 9 13:00 (scl-64)cse1 pts/3 Apr 9 13:18 (scl-41.smkfomra.com)ecea pts/4 Apr 9 13:18 (scl-29.smkfomra.com)
[vijai@localhost vijai]$ who am i
vijai pts/0 Apr 9 13:00 (scl-64)
[vijai@localhost vijai]$ tty
/dev/pts/0
[vijai@localhost vijai]$ uname
mailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhost -
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Linux
[vijai@localhost vijai]$ uname -r
2.4.20-8smp
[vijai@localhost vijai]$ uname -n
localhost.localdomain
[vijai@localhost vijai]$ echo "How are you"
How are you
[vijai@localhost vijai]$ echo $HOME
/home/vijai
[vijai@localhost vijai]$ echo $USER
vijai
[vijai@localhost vijai]$ bc
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
3+5
8
2%3
2
[vijai@localhost loops]$ pwd
/home/vijai/shellscripts/loops
[vijai@localhost vijai]$ mkdir filter
[vijai@localhost vijai]$ ls
filter list.sh regexpr shellscripts
mailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhost -
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[vijai@localhost vijai]$ cd shellscripts/loops/
[vijai@localhost loops]$
[vijai@localhost loops]$ cd
[vijai@localhost vijai]$
[vijai@localhost loops]$ cd /
[vijai@localhost /]$
[vijai@localhost /]$ cd /home/vijai/shellscripts/loops/
[vijai@localhost loops]$ cd ..
[vijai@localhost shellscripts]$
[vijai@localhost vijai]$ rmdir filter
[vijai@localhost vijai]$ ls
list.sh regexpr shellscripts
[vijai@localhost vijai]$ cat > greet
hi ece-a
wishing u the best
[vijai@localhost vijai]$ cat greet
hi ece-a
wishing u the best
[vijai@localhost vijai]$ cat >> greet
bye
[vijai@localhost vijai]$ cat greet
hi ece-a
wishing u the best bye
mailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhost -
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[vijai@localhost vijai]$ ls
greet list.sh regexpr shellscripts
[vijai@localhost vijai]$ ls -a
. .bash_logout .canna .gtkrc regexpr .viminfo.tmp
.. .bash_ rofile .emacs .kde shellscri ts .xemacs
.bash_history .bashrc greet list.sh .viminfo
[vijai@localhost vijai]$ ls -l
total 16
-rw-rw-r-- 1 vijai vijai 32 Apr 11 14:52 greet
-rw-rw-r-- 1 vijai vijai 30 Apr 4 13:58 list.shdrwxrwxr-x 2 vijai vijai 4096 Apr 9 14:30 regexpr
drwxrwxr-x 7 vijai vijai 4096 Apr 4 14:57 shellscripts
[vijai@localhost vijai]$ cp greet ./regexpr/
[vijai@localhost vijai]$ ls
mailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhost -
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greet list.sh regexpr shellscripts
[vijai@localhost vijai]$ ls ./regexpr demo greet
[vijai@localhost vijai]$ cp -i greet ./regexpr/
cp: overwrite 'greet'? n
[vijai@localhost vijai]$ mv greet greet.txt
[vijai@localhost vijai]$ ls
greet.txt list.sh regexpr shellscripts
[vijai@localhost vijai]$ mv greet.txt ./regexpr/[vijai@localhost vijai]$ ls list.sh regexpr
shellscripts [vijai@localhost vijai]$ ls
./regexpr/ demo greet.txt
[vijai@localhost vijai]$ ls
fact.sh list.sh prime.sh regexpr shellscripts
[vijai@localhost vijai]$ rm -i *.sh rm: remove
regular file `fact.sh'? y rm: remove regular file
`list.sh'? n rm: remove regular file `prime.sh'? y
[vijai@localhost vijai]$ ls
list.sh regexpr shellscripts
[vijai@localhost vijai]$ wc list.sh
4 9 30 list.sh
[vijai@localhost vijai]$ wc -l list.sh
4 list.sh
[vijai@localhost vijai]$ cmp list.sh fact.sh
list.sh fact.sh differ: byte 1, line 1
[vijai@localhost vijai]$ ls -l list.sh
-rw-rw-r-- 1 vijai vijai 30 Apr 4 13:58 list.sh
mailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhost -
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[vijai@localhost vijai]$ chmod ug+x list.sh [vijai@localhost vijai]$ ls -l
list.sh
-rwxrwxr-- 1 vijai vijai 30 Apr 4 13:58 list.sh
[vijai@localhost vijai]$ chmod 740 list.sh
[vijai@localhost vijai]$ ls -l list.sh
-rwxr----- 1 vijai vijai 30 Apr 4 13:58 list.sh
mailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhostmailto:vijai@localhost -
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RESULT
Thus the stud y and execution of Unix commands has been completed
Successful ly.
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Ex. No: 1.3 STUDY OF VI EDITOR
DATE
Aim
To introduce the concept of text editing vi editor and the options regarding the
control of the editor.
vi
Editor
A text editor is one of the most common and useful tools in all Operating
Systems. Unix provides a versatile editor vi, a full-screen editor and owes its origin
to Bill Joy. "vi" stands for visual editor. A vi session begins by invoking vi with or
without a filename
$vi
$vifilename
The user is presented with a full empty screen, each line beginning with a ~. This is
vi's way of indicating non-existent lines. Out of 25 lines on the terminal, 24 can be
used to enter text. The last line is reserved for commands and also used by the system
to display messages. vi functions in three modes namely:
1. Input modeWhere any key depressed is entered as text
2. Command modeWhere keys are used as commands to act on text (initial
mode)
3. ex modeex mode commands that can be entered in the last line to act on text
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INPUT MODE
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vi modes
vistarts with command mode. To insert text any of the following commands should be
used.
Commands Functioni Inserts text to the left of the cursor.I Inserts text at the beginning of line.a Appends text to right of cursorA Appends text at end of lineo Opens line belowO Opens line above
In Input mode the editor displays INSERT in the last line. Press Enter key to start a
fresh line of text in Input mode and the ~ disappears. To quit inputmode pressEsc key.
COMMAND MODE
EDIT COMMANDS
Command FunctionR Replaces more than a single character. The editor displays
s Deletes a single character to the left and switches to Input mode.x Deletes the character in the current cursor position?text Locates the text in the file. If not found, the message "Pattern not
"U or u Reverses the last chan
dd Cuts the entire linedw Cuts the entire wordd$ Cuts a line from cursor position to the end of the lined0 Cuts from the cursor position to the start of the line
Co ies ( anks the entire lineyw Copies the entire wordp Pastes the text
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Command Functionb Moves back to beginning of a wordw Moves forward to beginning of word| Moves to start of the line
$ Moves to end of the linek Up one linej Down one lineh Left one characterl Right one characterCtrl+f Scrolls a page forwardCtrl+b Scrolls a page backwardlG To move to the specific line
One of the most notable features of vi is the facility of prefixing a number to
most commands. When prefixed, commands interpret the instruction to be repeated as
many times. For example 3x deletes the next three character.
THE EX
MODE
The essential save and exit commands form the features of ex mode. Press :
(colon) in command mode to switch to ex mode. The : is displayed in the last line.
Type the command and pressEnterkey to execute the same.
Command Functionw Saves file, displays the number of lines & characters and
wfile The file is saved under the given nameL1,L2 wfile Used to write specific line numbers to some file. The . (dot)
q Quits vi session and returns to $ prompt. vi has a safety
q! Quits vi session without saving any changes made since the lastwq Save and exitsh Escape to shell%s/Sstr/Rstr/g This is yet another powerful feature known as substitution.
It is similar to Find and Replace. % represents all lines, g
rfile To insert another file into the current file.
newfile Splits screen into multiple windows and opens the file.
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~
~
~
~
~~
~
~
~
Sample.txt [New File]
This is vi improved vim
A rudimentary text
~
~
~
~
~
~
~
~
~
Sample.txt 2L, 30C written
vi Editorfor new file
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RESULT
Thus the study of text manipulation using vi editor has been completedsuccessfully.
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EXP NO: Finding the Cube
DATE:
AIM
ALGORITHM
1. Enter the value of a number.2. Perform the product of the given number thrice.3. Display the result.
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PROGRAM:
echo "enter a number"
read a
let b=$a*$a*$a
echo " the cube is $b"
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OUTPUT
enter a number
3
the cube is 27
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RESULT
EX NO: Student Details
DATE:
AIM
ALGORITHM
1. Start the program.2. Get name,DOB,reg.no and percentage respectively.3. Display the details4. Stop the program
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PROGRAM:
echo "enter the name"
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read n
echo "enter the DOB"
read d
echo "enter the reg.no"
read r
echo "enter the percentage"
read p
echo "name: $n"
echo "DOB: $d"
echo "reg.no: $r"
echo "percentage: $p"
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OUTPUT:
enter the name
murugan
enter the DOB
14.5.1993
enter the reg.no
48
enter the percentage
95
name: murugan
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DOB: 14.5.1993
reg.no: 48
percentage: 95
RESULT:
EX NO: Sum Of N Numbers
DATE:
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AIM:
ALGORITHM:
1. Enter the limit as n.2. Initialize i as 1 and sum as 0.3. Compute the value of sum and i until i is less than or equal to n.4. Sum is computed by adding the value of sum and i.5. i is computed by adding one to i.6. Display the result by sum.
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PROGRAM:
echo "enter limit"
read n
i=1
sum=0
while [ $i -le $n ]
do
let sum=$sum+$i
let i=$i+1
done
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echo " the sum of $n numbers is $sum"
OUTPUT:
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enter limit
8
the sum of 8 numbers is 36
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RESULT
EX NO : PROGRAM IMPLEMENTING FOR LOOP
DATE:
AIM:
ALGORITHM:
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PROGRAM:
echo "program implementing for loop"
sum=0
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for i in 1 2 3 4 10
do
sum=`expr $sum + $i`
done
echo "the sum is $sum"
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OUTPUT:
program implementing for loop
the sum is 20
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RESULT:
EXP NO : Electricity Bill Calculation
DATE:
AIM:
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ALGORITHM:
1. Get the previous unit and current unit.2. Calculate the current consumed.3. If the current consumed is greater than 1000 then amount is the product of current
consumed and 0.9.
4. If the current consumed is greater than 500 and less than 1000 then amount is theproduct of current consumed and 0.6.
5. If the current consumed is less than 500 then amount is the product of currentconsumed 0.9.
6. Display the amount for the current consumed.
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PROGRAM:
echo "enter the previous unit and current unit"
read pu cu
let cc=$cu-$pu
if [ $cc -gt 1000 ]
then
let amt=$cc*9/10
elif [ $cc -gt 500 -a $cc -le 1000 ]
then
let amt=$cc*6/10
else
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let amt=$cc*3/10
fi
echo "the amount is : $amt"
OUTPUT:
enter the previous unit and current unit
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1000 2000
the amount is : 600
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RESULT:
EX NO: NET SALARY
DATE:
AIM:
ALGORITHM
1. Enter the basic pay,hra,ta,da and pf.2. Add the basic pay,hra, ta,da and save it as the gross salary.3. If gross salary is greater then 10000 then income tax equals the product of gross
salary and 0.5.
4. If gross salary is less than 10000 then income tax equals the product of grosssalary and 0.2.
5. Assign deduction as the sum of pf and it.6. Net salary the difference between gross salary and deduction.
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PROGRAM:
echo "enter the basic pay,hra,ta,da and pf"
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read bp hra ta da pf
let gs=$bp+$hra+$ta+$da
if [ $gs -ge 10000 ]
then
let it=$gs*5/100
else
let it=$gs*2/100
fi
let de=$pf+$it
let ns=$gs-$de
echo "net salary : $ns"
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OUTPUT:
enter the basic pay,hra,ta,da and pf
1200 350 450 800 250
net salary : 2494
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RESULT:
EX NO : MULTI WAY BRANCHING USING CASE STATEMENT
DATE:
AIM:
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ALGORITHM:
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PROGRAM:
echo "concept of multi-way branching using case statement"
clear
echo "1.To know your current directory"
echo "2.todays date"
echo "3.list of users"
echo "enter your choice"
read choice
case $choice in
1) pwd;;
2) date;;
3) who;;
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*)echo "only give inputs from 1 to 3"
esac
OUTPUT:
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1.To know your current directory
2.todays date
3.list of users
enter your choice
1
/home/linuxpert
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RESULT:
EX NO: CHECKING WHETHER A NUMBER IS PRIME OR NOT
DATE:
AIM:
ALGORITHM:
1. Read the value of n.2. Assign the value of x as 0 and i as 2.3. Increment the value of i until it reaches n.4. Perform the modulo of n with i and store it in s.5. If s equals zero then assign x as 1.6. IF x equals 1 then print n is not a prime number.7. If x doesn't equal 1 the print n is a prime number.
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PROGRAM:
echo "enter the number"
read n
x=0
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for((i=2;i
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OUTPUT:
enter the number
7
7 is a prime number
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RESULT
EX NO FACTORIAL NUMBER
DATE:
AIM:
ALGORITHM:
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1. Read the value of n.2. Assign the value of i and fact as 1.3. Find the product of fact and i until i is less than or equal to 1.4. Increment the value of i value by 1.5.
Print the factorial value.
PROGRAM:
echo "enter the limit"
read n
i=1
fact=1
while [ $i -le $n ]
do
let fact=$fact*$i
let i=$i+1
done
echo "factorial of $n is $fact"
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OUTPUT:
enter the limit
7
factorial of 7 is 5040
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RESULT:
EX NO: ARITHMETIC OPERATION USING SWITCH CASE
DATE:
AIM:
ALGORITHM:
1. Get the values and choice.
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2. If choice is one, addition is performed and sum is displayed.3. If choice is two, subtraction is performed and difference is displayed.4. If choice is three, multiplication is performed and product is displayed.5. If choice is four, division is performed and quotient is displayed.
PROGRAM
echo "1.addition 2.subtraction 3.multiplication 4.division"
echo "enter the choice"
read n
echo "enter the values"
read a b
case $n in
1)let x=$a+$b
echo "the sum is $x";;
2)let x=$a-$b
echo "the difference is $x";;
3)let x=$a*$b
echo "the product is $x";;
4)let x=$a/$b
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echo "the quotient is $x";;
*)echo "invalid choice"
exit
esac
OUTPUT:
1.addition 2.subtraction 3.multiplication 4.division
enter the choice
4
enter the values
4 2
the quotient is 2
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RESULT:
EX NO : FIBONACCI SERIES
DATE:
AIM:
ALGORITHM:
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PROGRAM:
echo "enter a number"
read n
a=0
b=1
i=3
echo "fibonacci series"
echo $a
echo $b
while [ $i -le $n ]
do
c=`expr $a + $b`
echo "$c"
a=$b
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b=$c
i=`expr $i + 1`
done
OUTPUT:
enter a number
5
fibonacci series
0
1
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1
2
3
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RESULT:
EX NO : ODD OR EVENDATE:
AIM:
ALGORITHM:
1. Get the number as x.2. read num.3. check if x % 2 equal 0 and if yes display the given number is even.4. Else display the given number is odd.
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PROGRAM:
echo "enter the numbers"
read num
x=`expr $num % 2`
if test $x -eq 0
then
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echo "$num is an even number"
else
echo "$num is an odd number"
fi
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OUTPUT:
enter the numbers
4
4 is an even number
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RESULT:
EX NO GREATEST OF THREE NUMBERS
DATE:
AIM:
ALGORITHM:
1. Read the variables.2. Check if A is greater than B and C
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3. If so,Print A is greater.4. Else, check if B is greater than C.5. If so, print B is greater, else print C is greater.
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PROGRAM:
echo -e "\t\t biggest among 3 nos\n"
echo "enter 3 values"
read a b c
if [ $a -gt $b ] && [ $a -gt $c ]
then
echo "$a is big"
elif [ $b -gt $c ]
then
echo "$b is big"
else
echo "$c is big"
fi
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OUTPUT:
biggest among 3 nos
enter 3 values
6 9 8
9 is big
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RESULT:
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EX NO : POSITIVE OR NEGATIVE
DATE:
AIM:
ALGORITHM:
1. Get the number as num.2. Check if num is greater than 0 , if yes display the given number is negative.3. Else display the given number is negative.
PROGRAM:
echo "enter a number"
read a
if [ $a -ge 0 ]
then
echo "$a is positive"
else
echo "$a is negative"
fi
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OUTPUT:
enter a number
-6
-6 is negative
enter a number
4
4 is positive
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RESULT:
EX NO : CHECK WHETHER NUMBERS ARE EQUAL OR NOT
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DATE:
AIM:
ALGORITHM:
1. Read a and b2. If a equals b then print numbers are equal.3. Else print numbers are not equal.
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PROGRAM:
echo "enter a number"
read a
echo "enter another number"
read b
if test $a -eq $b
then
echo "numbers are equal"
else
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echo "number are not equal"
fi
OUTPUT:
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enter a number
4
enter another number
5
number are not equal
RESULT:
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EX NO : NATURAL NUMBER UPTO LIMIT N
DATE:
AIM:
ALGORITHM:
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PROGRAM:
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echo enter the limit
read n
echo N natural number upto the limit $n is
i=0
while [ $i -lt $n ]
do
i=`expr $i + 1`
echo $i
done
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OUTPUT:
enter the limit
4
N natural number upto the limit 4 is
1
2
3
4
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RESULT:
EX NO: SWAPPING OF TWO NUMBERS
DATE:
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AIM :
ALGORITHM:
1. Enter the two numbers such as and b to be swapped.2. Assign a to the temp variable t.3. Assign the value of b to a.4. Assign the temp value to b.5. Display the value of a and b.
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PROGRAM
echo "enter two numbers"
read a b
t=$a
a=$b
b=$t
echo "a=$a b=$b"
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OUTPUT:
enter two numbers
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3 4
a=4 b=3
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RESULT
EX NO: AREA OF CIRCLE
DATE:
AIM:
ALGORITHM:
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pi=`expr "scale=2; 22 / 7"| bc`
readonly pi
echo -n "enter value for radius:"
read radius
area=`expr "scale=2; $pi * $radius * $radius" | bc`
circum=`expr "scale=2; 2 * $pi * $radius" | bc`
echo "area: $area"
echo "circumference: $circum"
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OUTPUT:
enter value for radius:12
area: 452.16
circumference: 75.36
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RESULT: