Shell script to accept a number from the user and display the number of days in that particular month.

Code:
echo Enter month
month=(30 31 29)
read mon
case "$mon" in
        [jJ][aA][nN]*) echo "No.of days : ${month[1]} ";;
        [fF][eE][bB]*) echo enter year
                       read year
                       let rem="$year % 4"
                       if [ $rem -eq 0 ] ; then
                          echo "No. of days : ${month[2]}"
                       else
                          echo "No. of days : 28 "
                       fi;;
         [mM][aA][rR]*) echo "No. of days : ${month[1]}";;
         [aA][pP][rR]*) echo "No. of days: ${month[0]}";;
         [mM][aA][yY]*) echo "No. of days: ${month[1]}";;
         [jJ[uU][nN]*)  echo "No. of days: ${month[0]}";;
         [jJ][uU][lL]*) echo "No. of days: ${month[1]}";;
         [aA][uU][gG]*) echo " No. of days: ${month[1]}";;
         [sS][eE][pP]*) echo " No. of days: ${month[0]}";;
         [aA][cC][tT]*) echo "No. of days: ${month[1]}";;
         [nN][oO][vV]*) echo "No. of days: ${month[0]}";;
         [dD][eE][cC]*) echo "No. of days: ${month[1]}";;
esac

Output:
[ty2011330@localhost ~]$ vi month.sh
[ty2011330@localhost ~]$ sh month.sh
Enter month
feb
enter year
2005
No. of days : 28

shell script to accept two numbers from user and display n^y using while loop.

Code:
echo Enter value for n:
read n
echo Enter value for y:
read y
iter=1
sum=1
while [ $iter -le $y ]
do
        let sum=sum*n
        let iter=$iter+1
done
echo $sum



Output:
[ty2011330@localhost ~]$ sh file21.sh
Enter value for n:
2
Enter value for y:
3
8

shell script to accept a number from user and display multiplication table of given number.

Code:
echo "Multiplication Table:"
tab=1
i=1
a=10
echo "Input Number :"
read x
echo
echo "Table of $x"
for i in 1 2 3 4 5 6 7 8 9 10
do
   i=`expr $x \*  $i`
   echo $i
done


Output:
[pritam1@localhost ~]$ sh demofor.sh
Multiplication Table:
Input Number :
15

Table of 15
15
30
45
60
75
90
105
120
135
150

shell script for menu driven program to see the contents of /etc/passwd, to see the list of users, to see present working directory or to exit.

Code:
echo enter
echo 1 to see the contents of /etc/passwd
echo 2 to see list of users
echo 3 to see present working directory
echo 4 exit
echo enter your choice
read n
case $n in
 1)   ls /etc ;;
 2)   ls /home;;
 3)   pwd;;
 4)  exit;;
*) echo enter the choice as 1,2,3or4;;
esac

Output:
[ty2011330@localhost ~]$ sh  file13.sh
enter
1 to see the contents of /etc/passwd
2 to see list of users
3 to see present working directory
4 exit
enter your choice
2
administrator  pritam   ty11305  ty11313  ty11321  ty11329  ty11337  ty11345
amita          pritam1  ty11306  ty11314  ty11322  ty11330  ty11338  ty11346
dipti          shital   ty11307  ty11315  ty11323  ty11331  ty11339  ty11347
exam5154       shital1  ty11308  ty11316  ty11324  ty11332  ty11340  ty11348
enter your choice
1
a2ps.cfg               inittab                   quotatab
a2ps-site.cfg          inputrc                   racoon
acpi                   iproute2                  raddb

enter your choice
3
/home/tybsc
enter your choice
4





2.



ans=Y
while [ $ans = "Y" ]
do
echo "          MENU"
echo "1 . Query on product"
echo "2 . Query on customer"
echo "0 . Exit"
echo "enter ur choice : "
read ch
case "$ch" in
1) echo "Enter product number :"
  read pno
  grep $pno masterdata
  echo "Query on other product : "
  read ans
  if(test $ans = "Y")
  then
      continue
  fi;;
2) echo "Enter customer number :"   
   read cno
   grep $cno transdata;;
0) exit;;
*) echo "Invalid choice. Try again..."
esac
done      

Shell Program to find the type of the character entered

echo Enter any character
read c
case $c in
[a-z]) echo Small Case letter;;
[A-Z]) echo Capital letter;;
[0-9]) echo digit;;
    ?) echo special symbol;;
    *) echo more than one character, reenter;;
esac

11)#Program to find the pattern

echo Enter the word
read str
case $str in
[aeiou]*) echo The word begins with a vowel;;
  [0-9]*) echo The word starts with a digit;;
  *[0-9]) echo The word ends with a digit;;
    ????) echo The word entered is 4 lettered word;;
       *) echo The word entered is either starts with a
          consonant or incorrect input;;
esac

Shell Script to accept a file name and check whether the file name exist or not in current directory .

Code:
echo -n "Enter the Filename : "
read fname
if [ -f $fname ]
then
        echo "File exists in the current directory. "
else
        echo "File with this name does not exist in the current directory."
fi


Output:
[ty2011330@localhost ~]$ sh j03.sh
Enter the Filename : file5
File exists in the current directory.
[ty2011330@localhost ~]$ sh j03.sh
Enter the Filename : file12
File with this name doesnot exist in the current directory.

Shell Script to accept a number from user and check whether the number is even or odd .

Code:
echo -n "Enter the number : "
read n
let rem=n%2
if test $rem -eq 0
then
        echo "$n is a even number ."
else
        echo "$n is a odd number ."
fi


Output:
[ty2011330@localhost ~]$ sh j11.sh
Enter the number : 7
7 is a odd number .
[ty2011330@localhost ~]$ sh j11.sh
Enter the number : 10
10 is a even number .