This is my little demo
#!/bin/bash read -p "Please input three numbers:" n1 n2 n3 if [ $n1 -gt $n2 ] && [ $n1 -gt $n3 ] then echo "max_num is $n1" elif [ $n3 -gt $n2 ] && [ $n1 -lt $n3 ] then echo "max_num is $n3" else echo "max_num is $n2" fi
The error [: missing `]] is reported mainly for the following reasons:
Spaces shall be used between if and ‘[‘, ‘[‘ and condition, ‘]’ and condition, ‘-GT’ and the number to be compared before and after;
When using relational operators’ && ‘ or ‘ | ‘in the middle, be sure to enclose the conditions before and after with square brackets.