Answer / vipul dalwala

if [ $# -ne 3 ]
then
echo "$0: number1 number2 number3 are not given" >&2
exit 1
fi

if [ $1 -eq $2 ] && [ $1 -eq $3 ]
then
echo "All the three numbers are equal"
elif [ $1 -eq $2 ] && [ $1 -gt $3 ]
then
echo "$1 and $2 numbers are equal and are largest
numbers among $1 $2 and $3"
elif [ $1 -eq $3 ] && [ $1 -gt $2 ]
then
echo "$1 and $3 numbers are equal and are largest
numbers among $1 $2 and $3"
elif [ $2 -eq $3 ] && [ $2 -gt $1 ]
then
echo "$2 and $3 numbers are equal and are largest
numbers among $1 $2 and $3"
elif [ $1 -eq $2 ] && [ $1 -lt $3 ]
then
echo "$3 is largest number among $1 $2 and $3"
elif [ $1 -eq $3 ] && [ $1 -lt $2 ]
then
echo "$2 is largest number among $1 $2 and $3"
elif [ $2 -eq $3 ] && [ $2 -lt $1 ]
then
echo "$1 is largest number among $1 $2 and $3"
elif [ $1 -gt $2 ] && [ $1 -gt $3 ]
then
echo "$1 is largest number among $1 $2 and $3"
elif [ $2 -gt $1 ] && [ $2 -gt $3 ]
then
echo "$2 is largest number among $1 $2 and $3"
elif [ $3 -gt $1 ] && [ $3 -gt $2 ]
then
echo "$3 is largest number among $1 $2 and $3"
else
echo "I can not figure out which number is
largest"
fi

Answer / a

mr imran/vipul

when i run this script it always say number not given
what is the reason and how would this ask for the those 3 numbers to be sorted ??

Answer / aseem

Hi Imran,

Could you please run your script with below parameter
4 45 1. It will give the output as "1 is the largest number"
reason is you have used only sort command not sort -nr so it will not sort in reverse order, so in your case head -1 will rather than tail -1.

Hi A,

Regarding your answer you have to run by below way.

say you are keeping your script in file test.sh
then

sh test.sh 43 1 34

Actually it takes the positional parameter so after script whatever input you provide it takes as parameter.

Feel free to send me email aseem02@gmail.com if you have any doubt regarding shell scripting, will glad to help you guys.

Answer / aseem

Hi

"In continuation to above answer.

If you want to write a script in more generic way.

if [ $# -eq 0 ]
then
echo "$0: numbers are not given" >&2
exit 1
fi
LARGEST=$(echo $* | xargs -n1 | sort -nr | tail -1)
echo "$LARGEST is largest number""

The above script is good but there is a small msitake. As
numeric sort is used in reverse order so the biggest number
will come first, so we should use head -1 rather than tail -
1

Answer / md. imran

if [ $# -eq 0 ]
then
echo "$: numbers are not given" >&2
exit 1
fi
LARGEST=$(echo $* |xargs -n1 |sort |head -1)
echo $LARGEST is largest number"

or if you want to take input from a file so type following
cat <filename>|xargs -n1|sort|head -1


Note : In first scipt mistake was in tail -1
right answer is head -1 which i have mentioned there.

thanks

Answer / vipul dalwala

In continuation to above answer.

If you want to write a script in more generic way.

if [ $# -eq 0 ]
then
echo "$0: numbers are not given" >&2
exit 1
fi
LARGEST=$(echo $* | xargs -n1 | sort -nr | tail -1)
echo "$LARGEST is largest number"

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