bash_conditions

main.sh

# Everything here prints "OK"

# 1 is true
if (( 1 )); then
    echo "OK"
else
    echo "NOT OK"
    exit 1
fi

# "1" is true
if (( "1" )); then
    echo "OK"
else
    echo "NOT OK"
    exit 1
fi


# 0 is false
if (( 0 )); then
    echo "NOT OK"
    exit 1
else
    echo "OK"
fi

# "0" is false
if (( "0" )); then
    echo "NOT OK"
    exit 1
else
    echo "OK"
fi

# An unset string is false
if (( "" )); then
    echo "NOT OK"
    exit 1
else
    echo "OK"
fi

# Another string is **false**
if (( "true" )); then
    echo "NOT OK"
    exit 1
else
    echo "OK"
fi