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+The command shows the available ACL categories if called without arguments. If a
+category name is given, the command shows all the Redis commands in the
+specified category.
+
+ACL categories are very useful in order to create ACL rules that include or
+exclude a large set of commands at once, without specifying every single
+command. For instance, the following rule will let the user `karin` perform
+everything but the most dangerous operations that may affect the server
+stability:
+
+    ACL SETUSER karin on +@all -@dangerous
+
+We first add all the commands to the set of commands that `karin` is able to
+execute, but then we remove all the dangerous commands.
+
+Checking for all the available categories is as simple as:
+
+```
+> ACL CAT
+ 1) "keyspace"
+ 2) "read"
+ 3) "write"
+ 4) "set"
+ 5) "sortedset"
+ 6) "list"
+ 7) "hash"
+ 8) "string"
+ 9) "bitmap"
+10) "hyperloglog"
+11) "geo"
+12) "stream"
+13) "pubsub"
+14) "admin"
+15) "fast"
+16) "slow"
+17) "blocking"
+18) "dangerous"
+19) "connection"
+20) "transaction"
+21) "scripting"
+```
+
+Then we may want to know what commands are part of a given category:
+
+```
+> ACL CAT dangerous
+ 1) "flushdb"
+ 2) "acl"
+ 3) "slowlog"
+ 4) "debug"
+ 5) "role"
+ 6) "keys"
+ 7) "pfselftest"
+ 8) "client"
+ 9) "bgrewriteaof"
+10) "replicaof"
+11) "monitor"
+12) "restore-asking"
+13) "latency"
+14) "replconf"
+15) "pfdebug"
+16) "bgsave"
+17) "sync"
+18) "config"
+19) "flushall"
+20) "cluster"
+21) "info"
+22) "lastsave"
+23) "slaveof"
+24) "swapdb"
+25) "module"
+26) "restore"
+27) "migrate"
+28) "save"
+29) "shutdown"
+30) "psync"
+31) "sort"
+```
+
+@return
+
+@array-reply: a list of ACL categories or a list of commands inside a given
+category. The command may return an error if an invalid category name is given
+as argument.