{"id":2358,"date":"2017-12-08T07:58:55","date_gmt":"2017-12-08T07:58:55","guid":{"rendered":"http:\/\/www.scmgalaxy.com\/tutorials\/?p=2358"},"modified":"2020-01-09T10:00:18","modified_gmt":"2020-01-09T10:00:18","slug":"shell-script-program-2","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/shell-script-program-2\/","title":{"rendered":"Shell script program 2"},"content":{"rendered":"

scmuser created the topic: Shell script program 2<\/strong><\/p>\n

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?<\/p>\n

tpatil replied the topic: Re: Shell script program 2<\/strong>
\nIf 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.<\/p>\n

#!\/bin\/bash<\/p>\n

if [ $# -lt 2 ]
\nthen
\n echo \"Usage: $0 arg1 arg2\"
\n exit
\nfi<\/p>\n

echo \"\\$1=$1\"
\necho \"\\$2=$2\"<\/p>\n

let add=$1+$2
\nlet sub=$1-$2<\/p>\n

echo -e \"Addition=$add\\nSubtraction=$sub\\n\"<\/code><\/p>\n

Hope this helps…<\/p>\n

renjith replied the topic: Re: Shell script program 2<\/strong>
\n#!\/bin\/ksh<\/p>\n

while echo ” Enter two numbers :\\n ” ; do
\necho “Enter num 1: “; read A;
\necho “Enter num 2: “; read B;
\nif [ -z $A -o -z $B ] ;then
\necho ” Invalid input , pls enter again”
\nelse
\nbreak
\nfi
\ndone<\/p>\n

export A B<\/p>\n

echo ” ************* MENU *********** \\n”
\necho ” 1. cal using bc “;
\necho ” 2. cal using expr”;
\necho ” enter you choice :”;
\nread c;<\/p>\n

case $c in
\n1) sum=`echo ” $A + $B “|bc` ;;
\n2) sum=`expr $A + $B` ;;
\n*) echo “invalid option , run script again”
\nesac<\/p>\n

if [ $? -eq 0 ]
\nthen echo ” Sum is $sum”
\nelse
\necho ” Script failed ”
\nfi<\/p>\n","protected":false},"excerpt":{"rendered":"

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