SourceCodePoint: 2013

TODAY=$(date +"%Y-%m-%d")
echo "May I know your name"
read name
echo "Your birthdate(yyyy-mm-dd)"
read birthdate
tmpDays=$( printf '%s' $(( $(date -u -d"$TODAY" +%s) - $(date -u -d"$birthdate" +%s))) )
age=$(( $tmpDays / 60 / 60 / 24 / 364 ))
echo Hai $name you are $age years old.

Output:

May I know your name
Satheesh
Your birthdate(yyyy-mm-dd)
1989-12-08
Hai Satheesh you are 24 years old.

Developing simple exercises in Unix Graphics.

Code:

clear
name=$(zenity --entry --title="Greeting user" --text="Enter your Name ")
d=$(date '+%H')
if [ $d -ge 0 ] && [ $d -lt 12 ]
then
zenity --info --title="Greeting user" --text="Good Morning $name"
elif [ $d -ge 12 ] && [ $d -lt 15 ]
then
zenity --info --title="Greeting user" --text="Good Afternoon $name"
else
zenity --info --title="Greeting user" --text="Good Evening $name"
fi

Output:

Writing C program to implement UNIX commands like grep.

Code:

#include<stdio.h> 
#include<unistd.h> 
#include<stdlib.h> 
#include <sys/types.h> 
#include <sys/stat.h> 
#include <unistd.h> 
#include<string.h> 
#include <fcntl.h> 

void match_pattern(char *argv[]) 
{ 
    int fd,r,j=0; 
    char temp,line[100]; 
    if((fd=open(argv[2],O_RDONLY)) != -1) 
    { 
        while((r=read(fd,&temp,sizeof(char)))!= 0) 
        { 
            if(temp!='\n') 
            { 
                line[j]=temp; 
                j++; 
            } 
            else 
            { 
                if(strstr(line,argv[1])!=NULL) 
                    printf("%s\n",line); 
                memset(line,0,sizeof(line)); 
                j=0; 
            } 

        } 
    }   
} 

main(int argc,char *argv[]) 
{ 
    struct stat stt; 
    if(argc==3) 
    { 
        if(stat(argv[2],&stt)==0) 
            match_pattern(argv); 
        else 
        { 
            perror("stat()"); 
            exit(1); 
        } 
    } 
}

Output:

elcot@elcot:~$ gcc -o g1 grepc.c
elcot@elcot:~$ ./g1 hai test1
hai how are you

Hints:

elcot@elcot:~$ gcc -o g1 grepc.c ->Compile
grepc.c ->program name
g1 -> create object

elcot@elcot:~$ ./g1 hai test1 -> Run
g1 -> object
hai -> string
test1 -> file name

This is grep command implementation.
grep syntax:
grep <String> <file name>

grep command is used to search a particular word in file.etc.

Study of UNIX filters like grep, tr, sed etc.

Code:

clear
echo -------------------------------------------------
echo '\tStudying grep,tr,sed commands'
echo -------------------------------------------------
echo Enter the file name
read f1
echo Number of lines in a file is :$(sed -n '$=' $f1)
echo Number of blank lines in a file : $(grep -c '^$' $f1)
echo File content in Uppercase
tr '[ a-z ]' '[ A-Z ]' < $f1

Output:

-------------------------------------------------
Studying grep,tr,sed commands
-------------------------------------------------
Enter the file name
t2
Number of lines in a file is :5
Number of blank lines in a file : 2
File content in Uppercase
THIS IS MY

FIRST PROGRAM

SEE SOURCECODEPOINT.BLOGSPOT.COM

Write a shell script that reads lines in a file and echo the line followed by the string “This line is line n” n=1, 2, 3…

Code:

clear
echo -------------------------------------------------
echo '\tNumbers for each line'
echo -------------------------------------------------
echo Enter the file name
read fname
sed = $fname | sed 'N;s/\n/\. /'

Output:

------------------------------------------------- 
 Numbers for each line 
------------------------------------------------- 
Enter the file name 
satheesh 
1. ravi 
2. satheesh 
3. prabu 
4. vino 
5. mano 
6. bala 
7. sudhan 
8. prakash 
9. raja 
10. kumar

Write a shell script that changes the text color

Code:

# Hints
# run in bash.For example :~$bash color1
clear
echo ---------------------------------------------
echo " Change text color"
echo ---------------------------------------------
echo -e "\e[33mThis is yellow\e[0m"

Output:

Hints:

In a program 33 is a color code
If you want change text color. You should change number only.
Some Color code:
White - 1
Red - 31
Green - 32
Yellow -33
Blue -34

Write a shell script that copies files in a directory and its subdirectory to another directory.

Code:

clear 
echo ----------------------------------- 
echo '\tCopy a Directories' 
echo ----------------------------------- 
echo You are working in directory 
pwd 
echo The files in directory are 
ls 
echo Enter the file name to copy 
read fname 
echo Enter directory path 
read path 
if cp $fname $path 
then 
        echo Files Copied. 
else 
        echo Files Not Copied 
fi

Output:

----------------------------------- 
 Copy a Directories 
----------------------------------- 
You are working in directory 
/home/elcot 
The files in directory are 
 Downloads  
Videos 
 Public  
age  
Music   
 Desktop  
test.sash    
Enter the file name to copy 
age 
Enter directory path 
/home/elcot/Music/ 
Files Copied.

Hints:

Before Copy a file

After Copy a file

Write a shell script that counts the number of blank lines in a file, count how many lines have a text ‘new’ in it, count how many lines have the last word having a value > 1000

Code:

clear

echo ----------------------------------

echo '\tNumber of lines'

echo ----------------------------------

echo Enter the file name

read f1

tl=$(sed -n '$=' $f1)

echo Total lines in a file is :$tl

bl=$(grep -c '^$' $f1)

echo Number of blank lines in a file : $bl

sl=$(expr $tl - $bl)

echo Number of text lines in file :$sl

Output:

----------------------------------

Number of lines

----------------------------------

Enter the file name

Total lines in a file is :6

Number of blank lines in a file : 3

Number of text lines in file :3

Write a shell script that checks if the contents of two files are same. If so, delete the second file.

Code:

clear

echo ---------------------------------------------------

echo '\tCheck the file , Delete if it same'

echo ---------------------------------------------------

echo Enter the first file name

read first

echo Enter the second file name

read second

if cmp $first $second

then

rm $second

echo The file is deleted.

else

echo Not Equal.

Output:

---------------------------------------------------

Check the file , Delete if it same

---------------------------------------------------

Enter the first file name

vvv

Enter the second file name

vvv1

The file is deleted.

Write a shell script that displays the calendar for present month, current working directory, and the files with the extension sash

Code:

#! /bin/sash -f

#Hints-1

#Open gedit and type the following program and Save with extension .sash and run $ sh programname.sash

#or

#Hints-2

# echo " " >> programname.sash ,type this line in last below a program and run sh programname and see the directory

#programname.sash file was created.

clear

echo The calendar for present month

cal

echo Current working directory

pwd

Output:

The calendar for present month

December 2013

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

Current working directory
/home/elcot

Write a shell script that searches for a particular pattern in files and displays the name of such files

Code:

clear

echo ------------------------------------------------------------

echo '\tsearches for a particular pattern in files'

echo ------------------------------------------------------------

echo Enter the word to searches for a particular pattern in files

read wname

echo Result a particular pattern:

for File in *

if [ -r $File ]

then

if [ $(grep $wname $File | wc -w) -gt 0 ]

then

echo $File.

done

Output:

------------------------------------------------------------

searches for a particular pattern in files

------------------------------------------------------------

Enter the word to searches for a particular pattern in files

satheesh

Result a particular pattern:

name_a.

name_asce.

name_desc.

satheesh.

vino.

Write a shell script to read user name and find whether the user is currently working in the system or not

Code:

clear
echo ---------------------------------------------
echo '\tUser currently working or not'
echo ---------------------------------------------
echo Enter the user name
read name
if who | grep $name
then
echo User is working currently.
else
echo User is not working currently.
fi

Output:

---------------------------------------------
User currently working or not
---------------------------------------------
Enter the user name
elcot
elcot tty7 2013-12-21 11:02 (:0)
elcot pts/0 2013-12-21 11:06 (:0.0)
User is working currently

Write a shell script to all files whose size is greater than specific size.

Code:

clear
echo -------------------------------
echo '\tFile List'
echo -------------------------------
echo Enter the file size
read s1
echo Files list whose size is greater than $s1 bytes size.
for File in *
do
if [ -f $File ]
then
s2=$(stat -c %s $File)

if [ $s2 -gt $s1 ]
then
echo $File
fi
fi
done

Output:

-------------------------------

File List

-------------------------------

Enter the file size

1025

Files list whose size is greater than 1025 bytes size.

satheesh1.pls

yuvan.pls

Write a shell script to get three arguments from the command line operand 1, operand 3 and perform all arithmetic operations

Code:

if [ $# -ne 3 ]
then
echo "$0:Given argument was wrong.Example sh programname 24 13 + " >&2
exit 1
fi
echo -----------------------------------------------------------
echo '\tArithmetic Expression using command argument'
echo -----------------------------------------------------------
a=$1
b=$2
op=$3
case $op in
'+')echo Addition : $(expr $a + $b);;
'-')echo Suubtraction : $(expr $a - $b);;
'*')echo Multiplication : $(expr $a \* $b);;
'/')echo Division : $(expr $a / $b);;
'%')echo Modules : $(expr $a % $b);;
*)echo This is not a choice
esac

Output:

elcot@elcot:~$ sh sum 24 12 /

-----------------------------------------------------------

Arithmetic Expression using command argument

-----------------------------------------------------------

Division : 2

Hints:

Example for run a program to all expression

elcot@elcot:~$ sh sum 24 12 +

elcot@elcot:~$ sh sum 24 12 -

elcot@elcot:~$ sh sum 24 12 “*”

elcot@elcot:~$ sh sum 24 12 /

elcot@elcot:~$ sh sum 24 12 %

Write a shell script to print the names of all files in the current working directory in alphabetical order using for loop

Code:

clear
echo -------------------------------------------------------
echo '\t file Names in current working directory'
echo -------------------------------------------------------

for File in *
do
if [ -f $File ]
then
echo $File
fi
done

Output:

------------------------------------------------------- 
  file Names in current working directory 
------------------------------------------------------- 
TamilKeyboardInfo.txt 
a.out 
aaa 
adam 
age 
age1 
append1 
armstrong 
b 
bca1 
boss-manual.desktop 
c1 
cat1.c 
check 
color1 
config.fish 
date11 
f1 
f1.c 
grepc.c 
myFile.txt 
read1 
read1.save 
satheesh 
satheesh1.pls

Write a shell script to get your name and greet you depending on time

Code:

clear
echo -------------------------------------------------
echo '\tGreeting user depending upon time'
echo -------------------------------------------------
echo Enter your name
read name
d=$(date '+%H')
echo " "
if [ $d -gt 1 ] && [ $d -lt 12 ]
then
echo Good Morning $name
elif [ $d -ge 12 ] && [ $d -lt 15 ]
then
echo Good Afternoon $name
else
echo Good Evening $name
fi

Output:

-------------------------------------------------

Greeting user depending upon time

-------------------------------------------------

Enter your name

Satheesh

Good Morning Satheesh

Write a linux shell program to perform count number of user’s login and print first login user information.

Write a shell script to count number of user’s login and print first login user information.

Code:

clear

echo --------------------------

echo '\tLogin User'

echo --------------------------

echo The number of users loggin in are

who | wc -l

echo First login user

who | head -1

Output:

--------------------------

The number of users loggin in are

First login user

elcot tty7 2013-12-21 11:02 (:0)

Write a linux shell program to perform Studying UNIX commands

Studying UNIX commands

Code:

clear 
echo --------------------------------------------- 
echo '\tStudying basic commands' 
echo --------------------------------------------- 
echo You are : 
who am i 
echo You are working in : 
pwd 
echo Who are all working : 
who 
echo Who are all in idle : 
who -u 
echo To search a word or letter in who command : 
who | grep elcot 
echo To search a word or letter in pwd command : 
pwd | grep elcot

Thursday, 19 December 2013

Linux basic shell scripting questions

Basic shell scripting questions

1. How do you find out what’s your shell? - echo $SHELL

2. What’s the command to find out today’s date? - date

3. What’s the command to find out users on the system? - who

4. How do you find out the current directory you’re in? - pwd

5. How do you remove a file? - rm

6. How do you remove a <="" b="">- rm -rf

7. How do you find out your own username? - who am i

8. How do you send a mail message to somebody? - mailsomebody@techinterviews.com -s ‘Your subject’ -c ‘cc@techinterviews.com‘

9. How do you count words, lines and characters in a file? - wc

10. How do you search for a string inside a given file? - grep string filename

11. How do you search for a string inside a directory? - grep string *

12. How do you search for a string in a directory with the subdirectories recursed? - grep -r string *

13. What are PIDs? - They are process IDs given to processes. A PID can vary from 0 to 65535.

14. How do you list currently running process? - ps

15. How do you stop a process? - kill pid

16. How do you find out about all running processes? - ps -ag

17. How do you stop all the processes, except the shell window? - kill 0

18. How do you fire a process in the background? - ./process-name &

19. How do you refer to the arguments passed to a shell script? - $1, $2 and so on. $0 is your script name.

20. What’s the conditional statement in shell scripting? - if {condition} then … fi

21. How do you do number comparison in shell scripts? - -eq, -ne, -lt, -le, -gt, -ge

22. How do you test for file properties in shell scripts? - -s filename tells you if the file is not empty, -f filename tells you whether the argument is a file, and not a directory, -d filename tests if the argument is a directory, and not a file, -w filename tests for writeability, -r filename tests for readability, -x filename tests for executability

23. How do you do Boolean logic operators in shell scripting? - ! tests for logical not, -a tests for logical and, and -o tests for logical or.

24. How do you find out the number of arguments passed to the shell script? - $#

25. What’s a way to do multilevel if-else’s in shell scripting? - if {condition} then {statement} elif {condition} {statement} fi

26. How do you write a for loop in shell? - for {variable name} in {list} do {statement} done

27. How do you write a while loop in shell? - while {condition} do {statement} done

28. How does a case statement look in shell scripts? - case {variable} in {possible-value-1}) {statement};; {possible-value-2}) {statement};; esac

29. How do you read keyboard input in shell scripts? - read {variable-name}

30. How do you define a function in a shell script? - function-name() { #some code here return }

31. How does getopts command work? - The parameters to your script can be passed as -n 15 -x 20. Inside the script, you can iterate through the getopts array as while getopts n:x option, and the variable $option contains the value of the entered option.

What are PIDs in linux?

What are PIDs ?

They are process IDs given to processes. A PID can vary from 0 to 65535.

What are links and symbolic links in UNIX file system?

Link is a utility program in UNIX which establishes a hard link from one directory to another directory....

What is use of sed command?

Sed command reads from a standard input and places it into the pattern space.......

How can shell scripts be debugged in unix?

A user when programming in shell may face an error. The user can make use of the -v and -x option with sh or bash command to debug the shell script. The syntax format of using the option is :
sh option {shell-script-name} or
bash option {shell-script-name}

The option in the above syntax can be either -v or -x. The -v option prints the shell input lines as they are read. The -x option on the other hand expands a simple command and along with it displays the value of the ps4 variable followed by the command. It also shows the complete list of expanded arguments.

What is GUI Scripting?

Graphical user interface provided the much needed thrust for controlling a computer and its applications. This form of language simplified repetitive actions. Support for different applications mostly depends upon the operating system. These interact with menus, buttons, etc.

Explain the “Exit” command?

Every program whether on UNIX or Linux should end at a certain point of time and successful completion of a program is denoted by the output 0. If the program gives an output other than 0 it defines that there has been some problem with the execution or termination of the problem. Whenever you are calling other function, exit command gets displayed.

What is shell variable?

A shell variable is a special variable that is set by the shell and is required by the shell in order to function correctly. Some of these variables are environment variables whereas others are local variables.

What is environment variable?

An environment variable is a variable that is available to any child process of the shell. Some programs need environment variables in order to function correctly. Usually a shell script defines only those environment variables that are needed by the programs that it runs.

What is Interactive mode Linux?

Interactive mode means that the shell expects to read input from you and execute the commands that you specify. This mode is called interactive because the shell is interacting with a user. This is usually the mode of the shell that most users are familiar with: you log in, execute some commands, and log out. When you log out using the exit command, the shell exits.

What is "grep" programe ?

The grep program is the primary tool for extracting interesting lines of text from input datafiles. POSIX mandates a single version with different options to provide the behavior traditionally obtained from the three grep variants: grep, egrep, and fgrep.

What is awk ?

An awk invocation can define variables, supply the program, and name the input files.

What is Shell's Responsibilities ?

The shell is responsible for the execution of all programs that you request from your terminal. Each time you type in a line to the shell, the shell analyzes the line and then determines what to do.The line that is typed to the shell is known more formally as the command line. The shell scans this command line and determines the name of the program to be executed and what arguments to pass to the program.

Linux is which kind of Operating System?

Linux is an Operating System which supports Multi User, Running a Number of Processes performing different tasks simultaneously.

Is Linux Operating system Virus free?

No! There doesn’t exist any Operating System on this earth that is virus free. However Linux is known to have least number of Viruses, till date, yes even less than UNIX OS. Linux has had about 60-100 viruses listed till date. None of them actively spreading nowadays. A rough estimate of UNIX viruses is between 85 -120 viruses reported till date.

What is the basic difference between UNIX and Linux Operating System.

Linux Operating System is Free and Open Source Software, the kernel of which is created by Linus Torvalds and community. Well you can not say UNIX Operating System doesn’t comes under the category of Free and Open Source Software, BSD, is a variant of UNIX which comes under the category of FOSS. Moreover Big companies like Apple, IBM, Oracle, HP, etc. are contributing to UNIX Kernel.

What is the core of Linux Operating System?

Kernel is the core of Linux Operating System. Shell is a command Line Interpreter, Command is user Instruction to Computer, Script is collection of commands stored in a file and Terminal is a command Line Interface.

Write a linux shell program to perform string manipulation

To perform string manipulation

Code:

clear

echo ---------------------------------------------

echo '\tString Manipulation'

echo ---------------------------------------------

echo Enter the String1

read s1

echo Enter the String2

read s2

s3=$s1$s2

len=$(expr length $s3)

lstring=$(expr $s3 | tr '[:upper:]' '[:lower:]')

ustring=$(expr $s3 | tr '[:lower:]' '[:upper:]')

echo "\nConcatinated String : $s3"

echo String Length : $len

echo String in Lowercase : $lstring

echo String in Uppercase : $ustring

Output:

---------------------------------------------

String Manipulation

---------------------------------------------

Enter the String1

Enter the String2

WIN

Concatinated String : asWIN

String Length : 5

String in Lowercase : aswin

String in Uppercase : ASWIN

Write a linux shell program to perform compare two files

To compare two files

Code:

clear

echo -----------------------------------

echo '\tCompare two files'

echo -----------------------------------

echo Enter the name of the First file

read first

echo Enter the name of the Second file

read second

cmp $first $second

Output:

-----------------------------------

Compare two files

-----------------------------------

Enter the name of the First file

satheesh

Enter the name of the Second file

ex1

satheesh ex1 differ: byte 1, line 1

Write a linux shell program to perform to check the given file is a directory or not

To check the given file is a directory or not

Code:

clear

echo ---------------------------------------------

echo '\t Check directory or not'

echo ---------------------------------------------

echo Enter the file name

read fname

if [ -d $fname ]

then

echo It is a directory.

else

echo It is not a directory.

Output:

---------------------------------------------

Check directory or not

---------------------------------------------

Enter the file name

sat

It is not a directory.

Write a linux shell program to perform set the attributes of a given file

To set the attributes of a given file

Code:

clear

echo ---------------------------------------------

echo '\tSetting The Attributes of A File'

echo ---------------------------------------------

echo Enter the name of the File

read filename

if chmod +x $filename

then

echo Successfully run mode attribute was set for file.

else

echo Attribute not set for file.

Output:

---------------------------------------------

Setting The Attributes of A File

---------------------------------------------

Enter the name of the File

sat

Successfully run mode attribute was set for file.

Write a linux shell program to prepare electricity bill

Prepare electricity bill

Code:

clear 
echo ----------------------------------------- 
echo '\tCalculate Electricity Charge' 
echo ----------------------------------------- 
echo Enter the Name 
read name 
echo Enter the Meter number 
read mno 
echo Enter the current month rea ding 
read cmr 
echo Enter the last month reading 
read lmr 
unit=$(expr $cmr - $lmr) 
if [ $unit -eq 0 ] 
then 
 charge=40 
elif [ $unit -gt 0 ] && [ $unit -le 100 ] 
then 
 charge=$(expr $unit \* 1) 
elif [ $unit -gt 100 ] && [ $unit -le 300 ] 
then 
 charge=$(expr 100 \* 1 + $unit - 100) 
elif [ $unit -gt 300 ] && [ $unit -le 500 ] 
then 
 charge=$(expr $unit \* 1 + 200 \* 2 + $unit - 300) 
elif [ $unit -gt 500 ] 
then 
 charge=$(expr 1400 + $unit - 400) 
fi 
echo -----------------------------------------  
echo '\tElectricity Billing' 
echo ----------------------------------------- 
echo "Name                  : $name" 
echo "Meter Number          : $mno" 
echo "Current Month reading : $cmr" 
echo "Last Month reading    : $lmr" 
echo "Unit                  : $unit" 
echo "Charge                : $charge" 
echo -----------------------------------------

Output:

----------------------------------------- 
 Calculate Electricity Charge 
----------------------------------------- 
Enter the Name 
SATHEESH 
Enter the Meter number 
E1234 
Enter the current month rea ding 
456 
Enter the last month reading 
123 
----------------------------------------- 
 Electricity Billing 
----------------------------------------- 
Name                  : SATHEESH 
Meter Number          : E1234 
Current Month reading : 456 
Last Month reading    : 123 
Unit                  : 333 
Charge                : 766 
-----------------------------------------

Write a linux shell program to perform get mark details of a student and display total and grade

Get mark details of a student and display total and grade

Code:

clear 
echo ----------------------------------- 
echo '\tStudent Mark List' 
echo ----------------------------------- 
echo Enter the Student name 
read name 
echo Enter the Register number 
read rno 
echo Enter the Mark1 
read m1 
echo Enter the Mark2 
read m2 
echo Enter the Mark3 
read m3 
echo Enter the Mark4 
read m4 
echo Enter the Mark5 
read m5 
tot=$(expr $m1 + $m2 + $m3 + $m4 + $m5) 
avg=$(expr $tot / 5) 
echo ----------------------------------- 
echo '\tStudent Mark List' 
echo ----------------------------------- 
echo "Student Name    : $name" 
echo "Register Number : $rno" 
echo "Mark1           : $m1" 
echo "Mark2           : $m2" 
echo "Mark3           : $m3" 
echo "Mark4           : $m4" 
echo "Mark5           : $m5" 
echo "Total           : $tot" 
echo "Average         : $avg" 
if [ $m1 -ge 35 ] && [ $m2 -ge 35 ] && [ $m3 -ge 35 ] && [ $m4 -ge 35 ] && [ $m5 -ge 35 ] 
then 
 echo "Result          : Pass" 
  
 if [ $avg -ge 90 ] 
 then 
  echo "Grade           : S" 
 elif [ $avg -ge 80 ] 
 then 
         echo "Grade           : A" 
 elif [ $avg -ge 70 ] 
 then 
         echo "Grade           : B" 
 elif [ $avg -ge 60 ] 
 then 
         echo "Grade           : C" 
 elif [ $avg -ge 50 ] 
 then 
         echo "Grade           : D" 
 elif [ $avg -ge 35 ] 
 then 
         echo "Grade           : E" 
 fi 
else 
 echo "Result          : Fail" 
fi 
echo -----------------------------------

Output:

----------------------------------- 
 Student Mark List 
----------------------------------- 
Enter the Student name 
SATHEESH 
Enter the Register number 
182123 
Enter the Mark1 
89 
Enter the Mark2 
76 
Enter the Mark3 
98 
Enter the Mark4 
89 
Enter the Mark5 
96 
----------------------------------- 
 Student Mark List 
----------------------------------- 
Student Name    : SATHEESH 
Register Number : 182123 
Mark1           : 89 
Mark2           : 76 
Mark3           : 98 
Mark4           : 89 
Mark5           : 96 
Total           : 448 
Average         : 89 
Result          : Pass 
Grade           : A 
-----------------------------------

Write a linux shell program to perform a menu driven program to check for file existence,file readable or not,file writeable or not,

Write a menu driven program to check for file existence, file

readable or not, file writeable or not

Code:

clear 
echo ------------------------ 
echo '\tCheck file' 
echo ------------------------ 
echo Enter the file name 
read f1 
echo 1.File existence or not 
echo 2.Readable or not 
echo 3.Writeable or not 
echo 4.Exit 
echo Enter your choice 
read choice 
case $choice in 
        1) 
  if [ -f $f1 ] 
  then 
   echo File was existence. 
  else 
   echo File was not existence. 
  fi 
  ;; 
        2) 
  if [ -r $f1 ] 
  then 
                        echo File was readable. 
                else 
                        echo File was not readable. 
                fi 
                ;; 

        3) 
    if [ -w $f1 ] 
                then 
                        echo File was writeable. 
                else 
                        echo File was not writeable. 
                fi 
                ;; 
  
        4) echo Thank you. ;; 
        *)echo This is not a choice 
esac

Output:

------------------------
Check file
------------------------
Enter the file name
satheesh
1.File existence or not
2.Readable or not
3.Writeable or not
4.Exit
Enter your choice
1
File was existence.

Write a linux shell program to perform Read 10 names from a file and sort in Ascending order Descending order

Read 10 names from a file and sort in Ascending order and Descending order

Code:

clear

echo ---------------------------------------------

echo '\t Ascending and Descending Order'

echo ---------------------------------------------

echo Enter the file name containing names

read name

sort -g $name > name_asce

sort -g -r $name > name_desc

echo The Ascending order names are

cat name_asce

echo The Descending order names are

cat name_desc

Output:

--------------------------------------------- 
  Ascending and Descending Order 
--------------------------------------------- 
Enter the file name containing names 
satheesh 
The Ascending order names are 
bala 
kumar 
mano 
prabu 
prakash 
raja 
ravi 
satheesh 
sudhan 
vino 
The Descending order names are 
vino 
sudhan 
satheesh 
ravi 
raja 
prakash 
prabu 
mano 
kumar 
bala

Write a linux shell program to perform a menu driven program to display today’s date,Processes of the system,user’s of the system,list files of the system

Write a menu driven program to display today’s date, Processes of the system, user’s of the system, list files of the system

Code:

clear

echo ---------------------------------------------

echo '\tMenu Implementation'

echo ---------------------------------------------

echo 1.Today DATE

echo 2.Process of the system

echo 3.Users of the system

echo 4.List of files

echo Enter your choice

read choice

case $choice in

1)date;;

2)ps;;

3)who;;

4)ls -1;;

*)echo This is not a choice

esac

Output:

---------------------------------------------

Menu Implementation

---------------------------------------------

1.Today DATE

2.Process of the system

3.Users of the system

4.List of files

Enter your choice

PID TTY TIME CMD

2458 pts/0 00:00:00 bash

2477 pts/0 00:00:00 sh

2479 pts/0 00:00:00 ps

Wednesday, 18 December 2013

Write a linux shell program to perform check for palindrome

Check for palindrome

Click me to definition for Palindrome

Code:

clear 
echo -------------------------------- 
echo '\t Polindrome' 
echo -------------------------------- 
echo Enter the number 
read n 
x=$n 
s=0 
while [ $n -gt 0 ] 
do 
        r=$(expr $n % 10) 
        s=$(expr $s \* 10 + $r) 
        n=$(expr $n / 10) 
done 
if [ $s -eq $x ] 
then 
        echo The given number is Polindrome. 
else 
        echo The given number is not Polindrome. 
fi

Output:

--------------------------------
Polindrome
--------------------------------
Enter the number
121
The given number is Polindrome.

Write a linux shell program to perform find the number of users who have logged in

Find the number of users who have logged in

Code:

clear

echo -----------------

echo '\tLogin'

echo -----------------

echo The number of users loggin in are

who | wc -l

Output:

-----------------

The number of users loggin in are

Write a linux shell program to perform check pattern matching using grep

Check pattern matching using grep

Code:

clear

echo ---------------------------------------------

echo '\tSearch a word in A particular File'

echo ---------------------------------------------

echo Type the string to be searched

read string

echo Type the name of the file

read filename

if grep $string $filename

then

echo A word in a paricular file.

else

echo A word not in paricular file.

Output:

---------------------------------------------

Search a word in A particular File

---------------------------------------------

Type the string to be searched

this

Type the name of the file

vino

A word not in paricular file.

Write a linux shell program to perform check for an adam number

Check for an Adam number

Click me to definition for Adam number

Code:

clear 
echo -------------------------------- 
echo '\tAdam or Not' 
echo -------------------------------- 
echo Enter the number 
read n 
x=$n 
s=0 
s1=0 
while [ $n -gt 0 ] 
do 
 r=$(expr $n % 10) 
 s=$(expr $s \* 10 + $r) 
 n=$(expr $n / 10) 
done 
y=$(expr $s \* $s) 
z=$(expr $x \* $x) 
while [ $z -gt 0 ] 
do 
        r1=$(expr $z % 10) 
        s1=$(expr $s1 \* 10 + $r1) 
        z=$(expr $z / 10) 
done 
if [ $s1 -eq $y ] 
then 
 echo The given number is Adam. 
else 
 echo The given number is not Adam. 
fi

Output:

--------------------------------
Adam or Not
--------------------------------
Enter the number
13
The given number is Adam.

Write a linux shell program to perform convert lowercase to uppercase using tr statement

Convert lowercase to uppercase using tr statement

Code:

clear

echo ---------------------------------------------

echo '\tlower case to UPPERCASE'

echo ---------------------------------------------

echo Enter the name of the File

read filename

echo File content in Uppercase

tr '[ a-z ]' '[ A-Z ]' < $filename

Output:

--------------------------------------------- 
 lower case to UPPERCASE 
--------------------------------------------- 
Enter the name of the File 
as 
File content in Uppercase 
RAVI 
SATHEESH 
PRABU 
VINO 
MANO 
BALA 
SUDHAN 
PRAKASH 
RAJA 
KUMAR

Write a linux shell program to perform check whether a number is prime or not using while

Prime or not using while

Click me to definition for prime number

Code:

clear

echo ---------------------------------------------

echo '\tPrime number or Not'

echo ---------------------------------------------

echo Enter the number

read n

i=2

ans=0

while [ $i -le $(expr $n - 1) ]

if [ $(expr $n % $i) -eq 0 ]

then

ans=$(expr $ans + $i)

i=$(expr $i + 1)

done

if [ $ans -eq 0 ]

then

echo The number $n is a prime.

else

echo The number $n is not a prime.

Output:

---------------------------------------------

Prime number or Not

---------------------------------------------

Enter the number

The number 11 is a prime

Write a linux shell program to perform display multiplication table

Multiplication table

Code:

clear

echo -----------------------------------

echo '\tMultiplication Table'

echo -----------------------------------

echo Enter table number

read tn

echo Enter how many rows

read n

i=1

while [ $i -le $n ]

k=$(expr $i \* $tn)

echo "$i * $tn = $k"

i=$(expr $i + 1)

done

Output:

Enter table number

Enter how many rows

1 * 6 = 6

2 * 6 = 12

3 * 6 = 18

4 * 6 = 24

5 * 6 = 30

Write a linux shell program to perform basic arithmetic operations using case

Basic arithmetic operations using case

Code:

clear 
echo ----------------------------------------------------- 
echo '\tEvaluation of Arithmetic expression' 
echo ----------------------------------------------------- 
echo Enter the a value 
read a 
echo  Enter the b value 
read b 
echo 1.Addition 
echo 2.Subtraction 
echo 3.Multiplication 
echo 4.Division 
echo 5.Modules 
echo Enter your choice 
read choice 
case $choice in 
        1)echo Addition       : $(expr $a + $b);; 
        2)echo Suubtraction   : $(expr $a - $b);; 
        3)echo Multiplication : $(expr $a \* $b);; 
        4)echo Division       : $(expr $a / $b);; 
        5)echo Modules        : $(expr $a % $b);; 
        *)echo This is not a choice 
esac

Output:

-----------------------------------------------------
Evaluation of Arithmetic expression
-----------------------------------------------------
Enter the a value
45
Enter the b value
5
1.Addition
2.Subtraction
3.Multiplication
4.Division
5.Modules
Enter your choice
4
Division : 9

Write a linux shell program to perform find the reverse of a number

Reverse of a number

Code:

clear 
echo ----------------------------------- 
echo '\tReverse A Number' 
echo ----------------------------------- 
echo Enter the n value 
read n 
n1=$n 
sum=0 
while [ $n -gt 0 ] 
do 
        x=$(expr $n % 10) 
        n=$(expr $n / 10) 
        sum=$(expr $sum \* 10 + $x) 
done 
echo Reverse the number $n1 is $sum

Output:
-----------------------------------
Reverse A Number
-----------------------------------
Enter the n value
123
Reverse the number 123 is 321