Shell script program 2

Posted on December 8, 2017February 27, 2021 | by scmgalaxy K

Post Views: 4

scmuser created the topic: Shell script program 2

Use a script to take two numbers as arguments and output their sum using (i) bc (ii) expr. include error – checking to test whether two arguments were entered?

tpatil replied the topic: Re: Shell script program 2
If I understand correctly your question, You want to pass 2 parameters to shell script and print the sum of those. Also, you want to throw error if the number of parametrs are less than 2.

#!/bin/bash


if [ $# -lt 2 ]

then

echo "Usage: $0 arg1 arg2"

exit

fi
echo "\$1=$1"

echo "\$2=$2"
let add=$1+$2

let sub=$1-$2

echo -e "Addition=$add\nSubtraction=$sub\n"

Hope this helps…

renjith replied the topic: Re: Shell script program 2
#!/bin/ksh

while echo ” Enter two numbers :\n ” ; do
echo “Enter num 1: “; read A;
echo “Enter num 2: “; read B;
if [ -z $A -o -z $B ] ;then
echo ” Invalid input , pls enter again”
else
break
fi
done

export A B

echo ” ************* MENU *********** \n”
echo ” 1. cal using bc “;
echo ” 2. cal using expr”;
echo ” enter you choice :”;
read c;

case $c in
1) sum=`echo ” $A + $B “|bc` ;;
2) sum=`expr $A + $B` ;;
*) echo “invalid option , run script again”
esac

if [ $? -eq 0 ]
then echo ” Sum is $sum”
else
echo ” Script failed ”
fi