Write a shell script to check whether the entered number is Armstrong or not

clear

echo enter any number..

read n

m=$n

sum=0

while [ $m != 0 ]

do

            y=`expr $m % 10`

            x=`expr $y \* $y \* $y`

            sum=`expr $sum + $x`

            m=`expr $m / 10`

done

if [ $sum -eq $n ]

then

            echo the number is armstrong...

else

            echo the number is not armstrong...

fi

Write a shell script to arrange numbers in ascending or descending order as per the user choice

echo enter the no of element

read n1

for (( i=0; i<$n1; i++ ))

do

            echo enter `expr $i + 1` the element.

            read a[$i]

done

for (( i=0; i<$n1; i++ ))

do

            for (( j=`expr $i + 1`; j<$n1; j++ ))

            do

                        if [ ${a[$i]} -gt ${a[$j]} ]

                        then

                                    x=${a[$i]}

                                    a[$i]=${a[$j]}

                                    a[$j]=$x

                        fi

            done

done

echo 1.Ascending  2.Descending

echo enter your choice...

read c

if [ $c = 1 ]

then

            echo the ascending order is....

            for (( i=0; i<$n1; i++ ))

            do

                        echo ${a[$i]}

            done

elif [ $c = 2 ]

then

            echo the descending order is...

            for (( i=$n1; i>0; i-- ))

            do

                        echo ${a[`expr $i - 1`]}

            done

else

            echo wrong choice......

fi

Write a shell script to accept two filenames and check if both exist. If the second filename exists, then the contents of the first filename should be appended to it. If the second filename does not exist then create a newfile with the contents of the first file

echo enter the file name

read first

echo enter the second file name

read second

if [ -e $first ]

then

if [ -e $second ]

then

cat $first>>$second

else

cat $first>$second

fi

fi

Write a shell script to accept an alphabet from the user and list all the files/directory starting with that alphabet in the current directory

echo enter character

read c

for i in `ls -l|tr -s " "|cut -d " " -f 9`

do

 x=`echo $i|cut -c 1`

if [ $x = $c ]

then echo $i

fi

done

Write a shell script to find the number of ordinary files and directory files in the current directory

f=0

d=0

for i in `ls -l|tr -s " "|cut -c 1`

do

if [ $i = "-" ]

then

f=`expr $f + 1`

elif [ $i = "d" ]

then

d=`expr $d + 1`

fi

done

echo no of ordinary files are $f

echo no of directories are $d

Write a shell script to find the file or directory with the maximum size in the current directory

max=0

for i in `ls -l|tr -s " "|cut -f 5 -d " "`

do

if [ $max -le $i ]

then

max=$i

fi

done

echo maximum size is: $max

Write a shell script to accept a number and a word as command line arguments and print the word the given number of times on each line

i=1

f=""

temp=$1" "

while [ $i -le $3 ]

do

f=$f$temp

i=`expr $i + 1`

done

i=1

while [ $i -le $2 ]

do

echo $f

i=`expr $i + 1`

done

Write a shell script to check if the input string is a palindrome

if [ $# -gt 0 ]

then

x=`echo $1 | wc -c`

x=`expr $x - 1`

final=""

while [ $x -gt 0 ]

do

c=`echo $1 | cut -c $x`

x=`expr $x - 1`

final=$final$c

done

fi

if [ $final = $1 ]

then

echo String is palindrome

else

echo The string is not palindrome

fi

¬Write a shell script to check whether the file whose name is scanned exists and readable

read file

if [ -e $file ]

then

if [ -r $file ]

then              

echo The file exists and readable

else

echo The file exist but not readable

fi

else

echo The file is not exist

fi

Write a shell script to accept the name of the user and check out if the same has logged in or not

echo Enter user name:

read user

f=1

for i in `who|tr -s " "|cut -d " " -f 1`

do

if [ $i = $user ]

then

echo The user is login now

f=0

break

fi

done

if [ $f != 0 ]

then

echo The user is logged off

fi