nottlkeys.lua

-- Desc: This script will return all keys that do not have a TTL set.
-- Usage: redis-cli --eval nottlkeys.lua

local nonttl = {}
local cursor = "0"
local done = false

while not done do
    repeat 
        local result = redis.call("SCAN", cursor, "MATCH", "*", "COUNT", 1000)
        cursor = result[1]
        local scanned = result[2]
        
        for i, key in ipairs(scanned) do
            local ttl = redis.call("TTL", key)
            if ttl == -1 then
                table.insert(nonttl, key)
            end
        end
        if cursor == "0" then
            done = true
        end
    until done
end

return nonttl