programming centre: January 2016

Tuesday, January 12, 2016

write a shell script to check whether given name exists in that file or not.(Assume there is a file “Names” with some strings.)

# search.sh

# Program : Assume there is a file “Names” with some strings. write a shell

script to check whether given name exists in that file or not

# Author : 141740

# Date : 17/03/2015

echo "Enter the name to search"

read name

flg=0

for s in `cat Names`

if [ $s == $name ]

then

flg=1

break

done

echo

if [ $flg -eq 1 ]

then

echo "Name is present in the file"

else

echo "Name is not present in the file"

Output:

[141740@localhost ~]$ cat Names

chaithra

Supritha

Neenu

Melody

[141740@localhost ~]$ sh search.sh

Enter the name to search

chaithra

Name is present in the file

[141740@localhost ~]$ sh search.sh

Enter the name to search

dsfcx

Name is not present in the file

[141740@localhost ~]$

write a shell script to find maximum and minimum integer in that file or not.(Assume there is a file “Numbers” with some integers)

# minmax.sh

# Program : Assume there is a file “Numbers” with some integers, write a shell script to find maximum and minimum integer in that file or not.

# Author : 141740

# Date : 17/03/2015

max=`cut -d ' ' -f1 numbers`

min=`cut -d ' ' -f1 numbers`

for num in `cat numbers`

if [ $num -gt $max ]

then

max=$num

done

for num in `cat numbers`

if [ $num -lt $min ]

then

min=$num

done

echo "The max elements is $max"

echo "The min element is $min"

Output:

[141740@localhost ~]$ cat numbers

10 20 30 40 50

[141740@localhost ~]$ sh minmax.sh

The max elements is 50

The min element is 10

[141740@localhost ~]$

Shell script to display all the files which start from a specific letter? For e.g., if letter = s then all files started with letter s should be displayed from the current directory.

# letter.sh

# Program : To display all the files which start from a specific letter? For e.g., if letter = s then all files started with letter s should be displayed from the current directory.

# Author : sujith

# Date : 17/03/2015

echo "Enter the letter"

read letter

flag=0

len=$(echo "$letter" | wc -c)

if [ $len -eq 2 ]

then

echo "The names of files starting with $len"

for str in `ls`

c=$(echo "$str" | cut -c1)

if [ $c == $letter ]

then

if [ -f $str ]

then

flag=1

echo $str

done

if [ $flag -eq 0 ]

then

echo "No files which start with the letter $letter"

else

echo "Enter only one letter"

Output:

[141740@localhost ~]$ sh letter.sh

Enter the letter

The names of files starting with 2

salary.c

sample

sample.c

samplex.c

search.sh

she116.sh

shel16.sh

shell10.sh

shell11.sh

shell12.sh

shell13.sh

shell1.sh

shell2.sh

shell3.sh

shell4.sh

shell5.sh

shell6.sh

shell7.sh

shell8.sh

shell9.sh

sin.c

sinloop.c

sqaure1.c

sqaure.c

square1.c

square.c

stack.cpp

std.c

strcmp.c

strconcat.c

string.l

strlen.c

strpal.sh

str.sh

structure.cpp

sum.c

[141740@localhost ~]$

[141740@localhost ~]$ sh letter.sh

Enter the letter

The names of files starting with 2

No files which start with the letter z

[141740@localhost ~]$

Write a shell script to count number of lines, number of words and number of character in a given file with menu options.

# menu.sh

# Program : Write a shell script to count number of lines, number of words and number of character in a given file with menu options.

# Author : sujith

# Date : 17/03/2015

echo "Enter the filename"

read file

echo "menu"

echo "1->lines"

echo "2->words"

echo "3->characters"

echo "4->exit"

echo "Enter the choice"

read choice

case $choice in

1) set `wc -l $file`

l=`echo $1`

echo "no of lines in $file is:$l"

continue;;

2) set `wc -w $file`

w=`echo $l`

echo "no of words in $file is: $w"

continue;;

3) set `wc -c $file`

c=`echo $l`

echo "no of characters in $file is : $c"

continue;;

echo "Invalid choice"

break;

esac

Output:

[141740@localhost ~]$ sh menu.sh

Enter the filename

str.sh

1->lines

2->words

3->characters

4->exit

Enter the choice

no of lines in str.sh is:29

[141740@localhost ~]$

[141740@localhost ~]$ sh menu.sh

Enter the filename

str.sh

1->lines

2->words

3->characters

4->exit

Enter the choice

no of words in str.sh is:77

[141740@localhost ~]$

[141740@localhost ~]$ sh menu.sh

Enter the filename

str.sh

1->lines

2->words

3->characters

4->exit

Enter the choice

no of characters in str.sh is : 357

[141740@localhost ~]$

Shell program to accept a string and display as shown in the following example, suppose str = “RAJESH”

# str.sh

# Program : To accept a string and display as shown in the following example, suppose str = “RAJESH”

					R
				R	A
			R	A	J
		R	A	J	E
	R	A	J	E	S
R	A	J	E	S	H

# Author : sujith

# Date : 17/03/2015

echo "Enter the word to print"

read str

len=$(echo "$str" | wc -c)

a=`expr $len \* 2 - 2`

len=`expr $len - 1`

echo "len=$len"

i=1

while [ $i -le $len ]

b=1

while [ $b -le $a ]

echo -n " "

b=`expr $b + 1`

done

a=`expr $a - 2`

l=1

while [ $l -le $i ]

ch=$(echo "$str" | cut -c$l)

echo -n " $ch"

l=`expr $l + 1`

done

echo " "

i=`expr $i + 1`

done

Output:

[141740@localhost ~]$ sh str.sh

Enter the word to print

RAJESH

len=6

					R
				R	A
			R	A	J
		R	A	J	E
	R	A	J	E	S
R	A	J	E	S	H

[141740@localhost ~]$

Shell program to check whether given string is palindrome or not.

# shellpalindrum.sh

# Program : To check whether given string is palindrome or not.

# Author : sujith

# Date : 16/03/2015

echo ”To check whether given string is palindrome or not”

echo "Enter the string"

read str

len=$(echo "$str" | wc -c)

while [ $len -gt 0 ]

ch=$(echo "$str" | cut -c $len)

echo -n "$ch"

s1=$s1$ch

len=`expr $len - 1`

done

echo ""

if [ $s1 != $str ]

then

echo " The string is not palindrome"

else

echo "The string is palindrome"

OUTPUT:

[141740@localhost ~]$ sh shellpalindrum.sh

To check whether given string is palindrome or not

Enter the string

malayalam

The string is palindrome

[141740@localhost ~]$

[141740@localhost ~]$ sh shellpalindrum.sh

To check whether given string is palindrome or not

Enter the string

english

hsilgne

The string is not palindrome

[141740@localhost ~]$

Shell program to convert a decimal number into its binary equivalent.

# deci2bin.sh

# Program : To convert a decimal number into its binary equivalent.

# Author : sujith

# Date : 16/03/2015

echo "Enter the num"

read n

val=0

power=1

while [ $n -ne 0 ]

r=`expr $n % 2`

val=`expr $r \* $power + $val`

power=`expr $power \* 10`

n=`expr $n \/ 2`

done

echo "Binary equivalent=$val"

OUTPUT

[141740@localhost ~]$ sh deci2bin.sh

Enter the num

Binary equivalent=110

[141740@localhost ~]$ sh shellprime.sh

Shell program to find out whether the given number is prime or not.

# shellprime.sh

# Program : To find out whether the given number is prime or not.

# Author : sujith

# Date : 16/03/2015

clear

echo "Enter the number"

read n

flag=0

i=2

if test $n -lt 1

then

flag=1

while test $i -lt $n

r=$(echo "$n%$i" | bc)

if test $r -eq 0

then

flag=1

i=`expr $i + 1`

done

if test $flag -eq 0

then

echo "It is a prime number"

else

echo "It is not a prime number"

Output:

[141740@localhost ~]$ sh shellprime.sh

Enter the number

It is a prime number

[141740@localhost ~]$

Enter the number

It is not a prime number

[141740@localhost ~]$