Shell Script

1. Shell Script Exercises

2. What is the output of? • $ echo "expr 6 + 5“ • expr 6 + 5 • $ echo 'expr 6 + 5‘ • 11

3. Write Script to see current date, time, username, and current directory. echo "Current date is `date`“ echo "User is $USER“ echo "Current directory `pwd`"

4. Write shell script that will add two numbers, which are supplied as command line argument, and if this two numbers are not given show error message. if [ $# -ne 2 ] then echo " Enter 2 number to find the sum“ else echo "Sum of $1 and $2 is `expr $1 + $2`“ fi

5. Write a shell script to find out biggest number from given three numbers. if [ $# -ne 3 ] then echo “Enter three number to compare them" elif [ $1 -gt $2 ] && [ $1 -gt $3 ] ; then echo "$1 is Bigest number" elif [ $2 -gt $1 ] && [ $2 -gt $3 ] ; then echo "$2 is Bigest number" else echo "$3 is Bigest number" fi

6. Write a shell script to read a number and find whether the number is odd or even. echo -n “Enter a number : “ read n rem=`expr $n % 2` If [ $rem -eq 0 ] then echo “$n is even number” else echo “$n is odd number” fi