How to use logical OR and logical AND in a bash script

The operators used in bash scripting for logical OR and logical AND are “||” and “&&” respectively.

The following snippet shows example usage of logical OR operator.

if [ "$a" -eq 30 ] || [ "$b" -eq 40 ]; then
    echo The logical OR condition met
else
    echo The logical OR condition not met
fi

The following snippet shows example usage of logical AND operator.

if [ "$a" -eq 24 ] && [ "$b" -eq 47 ]; then
    echo The logical AND condition met
else
    echo The logical AND condition not met
fi