SCRIPT EXISTS sha1 [sha1 ...]
Time complexity: O(N) with N being the number of scripts to check (so checking a single script is an O(1) operation).
ACL categories: @slow, @scripting
Returns information about the existence of the scripts in the script cache.
This command accepts one or more SHA1 digests and returns a list of ones or
zeros to signal if the scripts are already defined or not inside the script
This can be useful before a pipelining operation to ensure that scripts are
loaded (and if not, to load them using
SCRIPT LOAD) so that the pipelining
operation can be performed solely using
EVALSHA instead of
EVAL to save
For more information about
EVAL scripts please refer to Introduction to Eval Scripts.
Array reply The command returns an array of integers that correspond to the specified SHA1 digest arguments. For every corresponding SHA1 digest of a script that actually exists in the script cache, a 1 is returned, otherwise 0 is returned.