write a shell script to find the largest number from 3 given
numbers.

Answers were Sorted based on User's Feedback

write a shell script to find the largest number from 3 given numbers...

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

 Is This Answer Correct ? 22 Yes 19 No

write a shell script to find the largest number from 3 given numbers...

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 ??

 Is This Answer Correct ? 3 Yes 0 No

write a shell script to find the largest number from 3 given numbers...

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.

 Is This Answer Correct ? 3 Yes 0 No

write a shell script to find the largest number from 3 given numbers...

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

 Is This Answer Correct ? 9 Yes 8 No

write a shell script to find the largest number from 3 given numbers...

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

 Is This Answer Correct ? 5 Yes 5 No

write a shell script to find the largest number from 3 given numbers...

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"

 Is This Answer Correct ? 13 Yes 15 No

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