UNIX – SHELL PROGRAMMING –LAB

1.  Write a shell script to accept even no of file names. Suppose 4 file names are supplied then the first file should get copied into the second file the third file should get copied into the fourth file and so on. If odd no. of file names is supplied then no copying should take place and error message should be displayed?

CheckNo=`expr $# % 2`
    if [ $CheckNo -ne 0 ]
    then
            echo "Enter Even Number Of Arguments."else
            cnt=1
            while [ $cnt -lt $# ]
            do
                    cp $1 $2
                    shift
                    shift
                    cnt=`expr $cnt + 2`
            done
    fi

2.  Write a script to list the files which have having read & execute permissions in the given directory?

3.  Write a shell program to find factorial of  given number using command line   ?

4.  Write a shell script to print the contents of a file only some range of lines. The starting and ending line numbers should be passing through command line arguments?
if [ -f $3 ]
then
if [ $1 -lt $2 ]
then
sed -n ' '$1','$2' 'p' ' $3
fi
fi
 

5   Write a shell script to take the backup of all C programs in your account on every Friday at 5 pm?

6.  Compress your home directory and copy to /tmp directory with different utilities? Then uncompress your home directory in /tmp by any one utility?

7. Write a shell script to reverse the digits of a given number.

if [ $# -ne 1 ]
then
echo "Usage: $0 number"
echo " I will find reverse of given number"
echo " For eg. $0 123, I will print 321"
exit 1
fi

n=$1
rev=0
sd=0

while [ $n -gt 0 ]
do
sd=`expr $n % 10`
rev=`expr $rev \* 10 + $sd`
n=`expr $n / 10`
done
echo "Reverse number is $rev"

8. Write a shell script to reverse the digits of a given number

9. Write a shell script to generate the factorial of a given number entered through keyboard.

10. Write a shell script to print the first even and odd numbers less than 30

11. Write a shell script to copy the source file to the target file.

12. Write a shell script which will accept different numbers and find sum of its digit.

if [ $# -ne 1 ]
then
echo "Usage: $0 number"
echo " I will find sum of all digit for given number"
echo " For eg. $0 123, I will print 6 as sum of all digit (1+2+3)"
exit 1
fi
n=$1
sum=0
sd=0
while [ $n -gt 0 ]
do
sd=`expr $n % 10`
sum=`expr $sum + $sd`
n=`expr $n / 10`
done
echo "Sum of digit for numner is $sum"

13. Write a shell script to find the mode of a file in a directory.

14. Write a menu driven program to display a menu of options and depending upon the user’s choice execute the associated command.

15. Write a shell script to display first ten positive numbers using until loop.

16. Write a shell script to Implement If-Else Ladder (Unix Program)

17.Write a shell script to link the files such that modification made by one file should be applicable to the linked file?

18.Write a script to determine whether given file is exists or not, filename is supplied as command line arguments and also display the file permissions if it exist.

19. Write a shell script for the following

     i) Redirecting the standard input

    ii) Redirecting the standard  output

    iii) Redirecting the standard error using switch case menu driven, & it should continue as long as user wants

20. Execute a command such that whenever we give NTTF <filename> it should create a directory and when ever we give REM <filename> it should delete the directory?

21. Write a shell script which displays the list of all files in the given directory

22. Write a shell script which counts the number of lines and words present in a given file.

23. Write a shell script to generate a multiplication table

24. Write a shell script that copies multiple files to a directory.

25. Write A shell script that takes a command –line argument and reports on whether it is directry ,a file,or something else

26. Write a shell script that computes the gross salary of a employee

27. Write a script to take backup at 10 am every day for selected file?

28. Execute any two commands at a time and store both the output in different files?

29. Write a program to display a message at 10:10am today and that should be sent to a mail?

30. How to make schedule for creating backup of user program for a particular user from root account?

31.  Write the shell script for the following operations using case

a.            Display all the running processes status in detail

b.            Start a process in the background for manual page for ls

c.             Display the current background process

d.            Terminate the background  process

32.  Write a shell script to add three float values using command line arguments

33. Write the shell script for List the filenames for which the 3rd character is not a digit?

34. Write a shell script to wish the user depending on his login time i.e to wish ‘good morning’, ‘good afternoon’, and ‘good evening’?

th=`date | cut –c12-13`
if [ $th –lt 12 ]
then
mesge=”good morning $LOGNAME have a nice day!”
fi
if [ $th –gt 12 –a $th –lt 16 ]
then
mesge=”good afternoon $LOGNAME”
fi
if [ $th –gt 16 –a $th –lt 20 ]
then
mesge=”good evening”
fi
echo –e “$mesg”

35. Write a shell script to show the file content in capitals for selected file by using command line arguments?

36. Write a shell script to find the given year is leap year or not?

37. write the shell script to find out the all ordinary files in your current working directory that are writable?

38. Write a script to find biggest among three entered numbers using command line arguments?

if [ $# -ne 3 ]
then
echo "$0: number1 number2 number3 are not given" >&2
exit 1
fi
n1=$1
n2=$2
n3=$3
if [ $n1 -gt $n2 ] && [ $n1 -gt $n3 ]
then
echo "$n1 is Bigest number"
elif [ $n2 -gt $n1 ] && [ $n2 -gt $n3 ]
then
echo "$n2 is Bigest number"

elif [ $n3 -gt $n1 ] && [ $n3 -gt $n2 ]
then
echo "$n3 is Bigest number"
elif [ $1 -eq $2 ] && [ $1 -eq $3 ] && [ $2 -eq $3 ]
then
echo "All the three numbers are equal"
else
echo "I can not figure out which number is biger"
fi

39. write a shell script to  Check whether the given character is small or capital?

40 Write a script to print entered no in descending order by using while loop

(eg : 5, 4, 3, 2, 1 ) using command line arguments?

41. Read a character from user if it is between A-D (print mesg: “entered character between A-D”) same way check for M-P and Q-V and display respective message?

42. Write a script for addition, subtraction, multiplication and division using command line arguments?

43. Write a script to see current date & time, username, home directory, default shell and current working directory using case statement & it should continue as long as user wants?

echo "Hello, $LOGNAME"
echo "Current date is `date`"
echo "User is `who i am`"
echo "Current direcotry `pwd`"

44. Write a shell program for making directory if that directory exists then print the mesg it’s already exists else create a directory by using command line arguments?

45. Write a shell script to check whether given name is a directory or file by using command line arguments?

46. Write a shell script to print sum of digits for entered no?

47. Write a shell script to accept date (dd,mm,yy) and increment day by 1 and check the condition and display the date (eg:20/12/2009)

48. Write a shell script to accept student information like name, class and 3 subject marks. Calculate the total and average. Result will be displayed based on average .if avg >=80 and avg <=90 (Distinction), avg >=60 and avg<=80 (First class), avg>=35 and avg<=59 (Second class), avg<35 (Fail)

49.   Write a shell script for the following using case statement

i)             Display the user who are all logged in system

ii)            Display the terminal type of the user

iii)           Compress the file,file name should get it from the user at runtime

iv)           Display the content of the compressed file

v)            Create the hardlink and softlink the filename should get it  from the user

vi)           Display the longlist of the hardling and softlink file

50.    Write a c program to find weather the given number is palindrome or not