I just want to know how to read a String and then compare it. If it is "Plus", then carry on
#!/bin/bash
echo -n Enter the First Number:
read num
echo -n Please type plus:
read opr
if [ $num -eq 4 && "$opr"= plus ]; then
echo this is the right
fi
#!/bin/bash
read -p 'Enter the First Number: ' num
read -p 'Please type plus: ' opr
if [[ $num -eq 4 && $opr == 'plus' ]]; then
echo 'this is the right'
fi
If you're using bash then I strongly recommend using double brackets. They're a lot better than single brackets; for example, they handle unquoted variables a lot more sanely, and you can use && inside the brackets.
If you use single brackets then you should write this:
if [ "$num" -eq 4 ] && [ "$opr" = 'plus' ]; then
echo 'this is the right'
fi
#!/bin/bash
echo -n Enter the First Number:
read num
echo -n Please type plus:
read opr
if [[ $num -eq 4 -a "$opr" == "plus" ]]; then
# ^ ^ ^
# Implies logical AND Use quotes for string
echo this is the right
fi
=, not ==, and extra quotes are not needed== with [[ ... ]]. Within a [ ... ], I agree = is recommended. Using quotes avoids confusion and is a good practice especially when you have some special characters. For a string like plus it is optional.[] the = is required, not merely recommended. And I agree quoting is good practice, but your comment gave the impression that the extra quotes would fix OP's problem. In general, I think it's best to add some explanation in an answer, instead of just dumping code.== within the [] as well as [[]].bash tag only. I was thinking of a "standard" shell.