Finding non-expiring keys in Redis

Question

In my setup, the info command shows me the following:

[keys] => 1128 [expires] => 1125 

I'd like to find those 3 keys without an expiration date. I've already checked the docs to no avail. Any ideas?

Answer 1

Modified from a site that I can't find now.

redis-cli keys  "*" | while read LINE ; do TTL=`redis-cli ttl "$LINE"`; if [ $TTL -eq  -1 ]; then echo "$LINE"; fi; done; 

edit: Note, this is a blocking call.

Answer 2

@Waynn Lue's answer runs but uses the Redis KEYS command which Redis warns about:

Warning: consider KEYS as a command that should only be used in production environments with extreme care. It may ruin performance when it is executed against large databases.

Redis documentation recommends using SCAN.

redis-cli --scan | while read LINE ; do TTL=`redis-cli ttl "$LINE"`; if [ $TTL -eq  -1 ]; then echo "$LINE"; fi; done; 

If you want to scan for a specific key pattern, use:

 redis-cli --scan --pattern "something*"