gistfile1.txt

$ cat /tmp/script.lua                                         :luarepl*: ??
redis.call('get','foo');
redis.replicate_commands();
redis.call('set','foo',math.random());
redis.call('set','bar',math.random());
return redis.call('get','foo')

redis-cli --slave (in a different terminal)

redis-cli --eval /tmp/script.lua
"0.1252478412935733"

(slave output is the following)
"MULTI"
"set","foo","0.1252478412935733"
"set","bar","0.41615338316939465"
"EXEC"