Bash -eq and ==, what's the diff?

Question

Why this works:

Output=$( tail --lines=1 $fileDiProva )
##[INFO]Output = \"OK\"

if [[ $Output == $OK ]]; then
    echo \"OK\"
else
    echo \"No Match\"
fi
         


        

Answer 1

-eq, -lt, -gt is only used for arithmetic value comparison(integers).

== is used for string comparison.