Shell Script for replacing a particular character of a file

Write a Shell Script for replacing a particular character of a file

Solution:

echo " Enter the name of the file to be edited"

read f

echo " Enter the character to be searched"

read s

echo " Enter the character to be substituted"

read w

echo " File after Modification"

cat $f | tr $s $w   

Execution:

Shell Script to check for Positive, negative and zero numbers

Write a Shell Script to check whether the entered number is positive, negative or zero.
Solution:

echo " Enter a number"

read n

if test $n -eq 0

then

echo "The entered number is zero"

elif test $n -lt 0

then echo "The number is negative"

else

echo " The number is positive"

fi   

Execution:

Shell Script to Delete a directory

Write a Shell Script to Delete a directory

Solution:

echo " Enter the name of the directory to be deleted"

read s

c=`ls $s | wc -l`

if test $c = 0

then

rmdir $s

else

rm -r $s

fi     

Output:
Enter the name of the directory to be deleted

abc

Shell Script to list the contents of a directory

Write a Shell Script to list the contents of a directory

Solution:

echo "Enter the name of the directory"

read d

ls $d

Shell Scripts to check whether the entered character is Vowel or not

Write a Shell Scripts to check whether the entered character is Vowel or not

Solution:

echo "Enter a character"

read a

case $a in

a) echo "It is a vowel";;

e) echo "It is a vowel";;

i) echo "It is a vowel";;

o) echo "It is a vowel";;

u) echo "It is a vowel";;

*) echo "Not a vowel";;

esac   

Execution:

Shell Script to find the sum of two numbers

Write a Shell Script to find the sum of two numbers

Solution:

echo "Enter the two numbers "

read a

read b

c=`expr $a + $b`

echo "Sum is $c"

Execution:

Shell Script to check whether a file is Writable

Write a Shell Script to check whether a file is Writable

Solution:

echo "Enter a file name"

read a

if [ ! -w $a ]

then

echo "File is not writable so you cannot edit the file"

else

echo "You can edit the file"

fi

Execution:

Shell Scripts to Copy the files

Write a Shell Script to Copy the files

Solution:

echo “Copy Files”

echo “Enter The Source File"

read s

echo “Enter The Destination File”

read d

cp $s $d

Execution:

Shell Script to see if a user is already exists

Write a Shell Script to see if a user is already exists

Solution:

echo "Enter The User Name"

read userid

if grep "^$userid:" /etc/passwd > /dev/null

then

echo "$userid already exists"

else

echo “The user is not exist”

exit

fi

Execution:

Shell Script for Counting upto required number

Write a Shell Script for Counting upto required number

Solution:

echo Enter any number

read a

echo Counting Starts

n=1

while [ $n -le $a ]

do

echo $n

n=`expr $n + 1`

done

Execution:

Shell Script for Celsius to Fahrenheit conversion

Write a Shell Script for Celsius to Fahrenheit conversion

Solution:

echo Enter Temperature in Celsius

read c

c=`echo $c \* 9 | bc`

c=`echo $c / 5 | bc`

c=`echo $c + 32 | bc`

echo Hence Temperature in Fahrenheit : $c

Execution:

Shell Script for String Concatenation

Write a Shell Script for String Concatenation

Solution:

echo String Concatenation

echo Enter First String

read s1

echo Enter second String

read s2

echo Concatenated String is: $s1 $s2

Execution:

Shell Script to Display Table of any number

Write a Shell Script to Display Table of any number

Solution:
echo Enter any number

read a

n=1

echo The table for your entered number is:

while [ $n -lt 11 ]

do

b=`expr $a \* $n`

echo "$n * $a = $b"

n=`expr $n + 1`

done

Execution:

Shell Script for Swapping two numbers

Write a Shell Script to Swap the two number

Solution:

echo Enter the two numbers 

read a b

if test $a -gt $b

then

a=`expr $a - $b`

b=`expr $a + $b`

a=`expr $b - $a`

else

b=`expr $b - $a`

a=`expr $a + $b`

b=`expr $a - $b`

fi

echo Swapped Value: $a and $b

Execution:

Shell Scripts to check for Prime numbers

Write a Shell Script to check whether a given number is Prime or not

Solution:

echo Enter any number

read num

b=`expr $num / 2`

if test $b -eq 1

then

echo It is a Prime number

fi

n=2

x=0

while [ $b -ge $n ]

do

c=`expr $num % $n`

if test $c -eq 0

then

echo Number is not prime

x=0

break

else

x=1

fi

n=`expr $n + 1`

done

if test $x -eq 1

then

echo It is a Prime number

fi

Solution:

Shell Script for Palindrome number

Write a shell script to check whether a given number is palindrome or not

Solution:

echo Enter the number

read num

d=`expr $num`

c=0

while [ $d -gt 0 ]

do

b=`expr $d % 10`

d=`expr $d / 10`

c=`expr $c \* 10 + $b`

done

if test $num -eq $c

then

echo The Given number is Palindrome

else

echo The number is not a Palindrome

fi

Execution:

Shell Script to find the Largest of three numbers

Write a Shell Script to find the Largest of three numbers

Solution:

echo Enter the Three numbers

read a b c

if test $a -gt $b

then

if test $a -gt $c

then

echo $a is greatest

else

echo $c is greatest

fi

elif test $b -gt $c

then

echo $b  is greatest

else

echo $c is greatest

fi

Execution:

Shell Script to find the Larger of two numbers

Write a Shell Script to find the Larger of two numbers

Solution:

echo Enter the  two numbers

read a b

if test $a -gt $b

then

echo $a is greater than $b

else

echo $b is greater than $a

fi

Execution:

Shell Script to find the Reverse and Sum of a number

Write a Shell Script to find the Reverse and Sum of a the entered numbers

Solution:

echo Enter any number

read n

rev=0

sd=0

sum=0

while [ $n -gt 0 ]

do

sd=`expr $n % 10`

rev=`expr $rev \* 10 + $sd`

sum=`expr $sum + $sd`

n=`expr $n / 10`

done

echo "Reverse number is $rev"

echo " sum of digits are $sum"  

Execution:

Shell Script for Fibonacci series

Write a Shell Script to find the Fibonacci series of any number

Solution:

echo Enter any number

read a

x=0

y=1

z=0

echo Fibonacci Series upto $a will be:

echo $x

echo $y

while [ $a -ge $z ]

do

z=`expr $x + $y`

if test $z -ge $a

then

exit

fi

echo $z

x=`expr $y`

y=`expr $z`

done

Execution: