How to write this in one line in bash

Question

How to write this in one line WITHOUT creating extra variables AND duplication of "5"?

A=5
B=10
([[ $A == B ]] && echo $A) || echo gt

Answer 1

A=5; B=10; ([[ $A == B ]] && echo $A) || echo gt

You can separate commands by ; ...

But it's rather unnecessary for most situations. By structuring code, one gets more insight in how it works.

Answer 2

echo gt

That is just one line, and it introduces no variable.

By the way - what's the use of that?

Answer 3

You don't need the parentheses around the bash test and and statement:

A=5; B=10; 
[[ $A -lt $B ]] && echo $A || echo "A >= B"

If you're upset about bulk, it's harder to make it more simple using bash. But since you are using bash, you have other programs at your disposal, such as python:

A=5; B=10;
python -c "print $A if $A < $B else 'A >= B'"

Or Perl:

A=5; B=10;
perl -le "print $A < $B ? $A : 'A >= B';"

Regardless of specific language choice, all are performing a similar task. In this specific case, the perl example is the "lightest". But note that Perl and Python may not be the most portable. If portability is an issue and you don't prefer Bash, consider awk:

A=5; B=10;
awk "BEGIN{print $A < $B ? $A : \"A >= B\"}"