如何检查 bash 中是否有超过 5 个输入可供读取？

Question

I want to take no more than 5 inputs, if there are more than 5 space separated inputs then it should ask for input again and display message "you have entered more than 5 inputs"

while true
do
echo "enter marks of 5 subjects"
read m1 m2 m3 m4 m5
if [ $m1 -le 100 ] && [ $m2 -le 100 ] && [ $m3 -le 100 ] && [ $m4 -le 100 ] && [ $m5 -le 100 ]
then
        break
else
 echo "marks cannot be more than 100"
fi
done

Answer 1

I would instead read into an array:

read -a m

You can then access the members as

${m[0]} ${m[1]} ${m[2]}

and so on...

And you can access the size of the array with

${#m[@]}

which can be used in testing whether you have too many (or too few) inputs.

Answer 2

Add m6 to read m1 m2 m3 m4 m5 and check if m6 is empty or not.

if [[ "$m6" != "" ]]; then echo "too many arguments"; else echo "ok"; fi