diff --git a/examples/client.lua b/examples/client.lua
index 682a549..5e9849c 100644
--- a/examples/client.lua
+++ b/examples/client.lua
@@ -18,15 +18,24 @@
 -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 -- THE SOFTWARE.
 
-require("zmq")
+local zmq = require"zmq"
 
-local ctx = zmq.init(1)
+local N=tonumber(arg[1] or 100)
+
+local ctx = zmq.init()
 local s = ctx:socket(zmq.REQ)
 
 s:connect("tcp://localhost:5555")
 
-s:send("SELECT * FROM mytable")
-print(s:recv())
+for i=1,N do
+	s:send("SELECT * FROM mytable")
+	local data, err = s:recv()
+	if data then
+		print(data)
+	else
+		print("s:recv() error:", err)
+	end
+end
 
 s:close()
 ctx:term()
diff --git a/examples/client_multipart.lua b/examples/client_multipart.lua
index e82ca26..4f10c58 100644
--- a/examples/client_multipart.lua
+++ b/examples/client_multipart.lua
@@ -18,17 +18,26 @@
 -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 -- THE SOFTWARE.
 
-require("zmq")
+local zmq = require"zmq"
 
-local ctx = zmq.init(1)
+local N=tonumber(arg[1] or 100)
+
+local ctx = zmq.init()
 local s = ctx:socket(zmq.REQ)
 
 s:connect("tcp://localhost:5555")
 
-s:send("SELECT * FROM mytable ", zmq.SNDMORE)
-s:send("WHERE library = 'zmq'")
+for i=1,N do
+	s:send("SELECT * FROM mytable ", zmq.SNDMORE)
+	s:send("WHERE library = 'zmq'")
 
-print(s:recv())
+	local data, err = s:recv()
+	if data then
+		print(data)
+	else
+		print("s:recv() error:", err)
+	end
+end
 
 s:close()
 ctx:term()
diff --git a/examples/ev_subscriber.lua b/examples/ev_subscriber.lua
index 876a0ea..13f51a9 100644
--- a/examples/ev_subscriber.lua
+++ b/examples/ev_subscriber.lua
@@ -18,65 +18,65 @@
 -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 -- THE SOFTWARE.
 
-require("zmq")
+local zmq = require"zmq"
 local ev = require'ev'
 local loop = ev.Loop.default
 
 -- define a sub_worker class
 local sub_worker_mt = {}
 function sub_worker_mt:close(...)
-    self.s_io_idle:stop(self.loop)
-    self.s_io_read:stop(self.loop)
-    return self.socket:close(...)
+	self.s_io_idle:stop(self.loop)
+	self.s_io_read:stop(self.loop)
+	return self.socket:close(...)
 end
 function sub_worker_mt:bind(...)
-    return self.socket:bind(...)
+	return self.socket:bind(...)
 end
 function sub_worker_mt:connect(...)
-    return self.socket:connect(...)
+	return self.socket:connect(...)
 end
 function sub_worker_mt:sub(topic)
-    return self.socket:setopt(zmq.SUBSCRIBE, topic)
+	return self.socket:setopt(zmq.SUBSCRIBE, topic)
 end
 function sub_worker_mt:unsub(topic)
-    return self.socket:setopt(zmq.UNSUBSCRIBE, topic)
+	return self.socket:setopt(zmq.UNSUBSCRIBE, topic)
 end
 sub_worker_mt.__index = sub_worker_mt
 
 local function sub_worker(loop, ctx, msg_cb)
-    local s = ctx:socket(zmq.SUB)
-    local self = { loop = loop, socket = s, msg_cb = msg_cb }
-    setmetatable(self, sub_worker_mt)
-    -- create ev callbacks for recving data.
-    -- need idle watcher since ZeroMQ sockets are edge-triggered instead of level-triggered
-    local s_io_idle
-    local s_io_read
-    s_io_idle = ev.Idle.new(function()
-        local msg, err = s:recv(zmq.NOBLOCK)
-        if err == 'timeout' then
-            -- need to block on read IO
-            s_io_idle:stop(loop)
-            s_io_read:start(loop)
-            return
-        end
-        self:msg_cb(msg)
-    end)
-    s_io_idle:start(loop)
-    s_io_read = ev.IO.new(function()
-        s_io_idle:start(loop)
-        s_io_read:stop(loop)
-    end, s:getopt(zmq.FD), ev.READ)
-    self.s_io_idle = s_io_idle
-    self.s_io_read = s_io_read
-    return self
+	local s = ctx:socket(zmq.SUB)
+	local self = { loop = loop, socket = s, msg_cb = msg_cb }
+	setmetatable(self, sub_worker_mt)
+	-- create ev callbacks for recving data.
+	-- need idle watcher since ZeroMQ sockets are edge-triggered instead of level-triggered
+	local s_io_idle
+	local s_io_read
+	s_io_idle = ev.Idle.new(function()
+		local msg, err = s:recv(zmq.NOBLOCK)
+		if err == 'timeout' then
+			-- need to block on read IO
+			s_io_idle:stop(loop)
+			s_io_read:start(loop)
+			return
+		end
+		self:msg_cb(msg)
+	end)
+	s_io_idle:start(loop)
+	s_io_read = ev.IO.new(function()
+		s_io_idle:start(loop)
+		s_io_read:stop(loop)
+	end, s:getopt(zmq.FD), ev.READ)
+	self.s_io_idle = s_io_idle
+	self.s_io_read = s_io_read
+	return self
 end
 
 local ctx = zmq.init(1)
 
 -- message handling function.
 local function handle_msg(worker, msg)
-    local msg_id = tonumber(msg)
-    if math.mod(msg_id, 10000) == 0 then print(worker.id, msg_id) end
+	local msg_id = tonumber(msg)
+	if math.mod(msg_id, 10000) == 0 then print(worker.id, msg_id) end
 end
 
 local sub1 = sub_worker(loop, ctx, handle_msg)
diff --git a/examples/publiser.lua b/examples/publisher.lua
similarity index 92%
rename from examples/publiser.lua
rename to examples/publisher.lua
index 12e240e..a5f943e 100644
--- a/examples/publiser.lua
+++ b/examples/publisher.lua
@@ -18,15 +18,15 @@
 -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 -- THE SOFTWARE.
 
-require("zmq")
+local zmq = require"zmq"
 
-local ctx = zmq.init(1)
+local ctx = zmq.init()
 local s = ctx:socket(zmq.PUB)
 
 s:bind("tcp://lo:5555")
 
 local msg_id = 1
 while true do
-    s:send(tostring(msg_id))
-    msg_id = msg_id + 1
+	s:send(tostring(msg_id))
+	msg_id = msg_id + 1
 end
diff --git a/examples/server.lua b/examples/server.lua
index 57bb278..3423c4e 100644
--- a/examples/server.lua
+++ b/examples/server.lua
@@ -18,14 +18,14 @@
 -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 -- THE SOFTWARE.
 
-require("zmq")
+local zmq = require"zmq"
 
-local ctx = zmq.init(1)
+local ctx = zmq.init()
 local s = ctx:socket(zmq.REP)
 
 s:bind("tcp://lo:5555")
 
 while true do
-    print(string.format("Received query: '%s'", s:recv()))
-    s:send("OK")
+	print(string.format("Received query: '%s'", s:recv()))
+	s:send("OK")
 end
diff --git a/examples/server_multipart.lua b/examples/server_multipart.lua
index 663c3f7..c26e3e0 100644
--- a/examples/server_multipart.lua
+++ b/examples/server_multipart.lua
@@ -18,18 +18,18 @@
 -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 -- THE SOFTWARE.
 
-require("zmq")
+local zmq = require"zmq"
 
-local ctx = zmq.init(1)
+local ctx = zmq.init()
 local s = ctx:socket(zmq.REP)
 
 s:bind("tcp://lo:5555")
 
 while true do
-    local query = s:recv()
-    while s:getopt(zmq.RCVMORE) == 1 do
-        query = query .. s:recv()
-    end
-    print(string.format("Received query: '%s'", query))
-    s:send("OK")
+	local query = s:recv()
+	while s:getopt(zmq.RCVMORE) == 1 do
+		query = query .. s:recv()
+	end
+	print(string.format("Received query: '%s'", query))
+	s:send("OK")
 end
diff --git a/examples/subscriber.lua b/examples/subscriber.lua
index 370b7dc..41434c7 100644
--- a/examples/subscriber.lua
+++ b/examples/subscriber.lua
@@ -18,14 +18,14 @@
 -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 -- THE SOFTWARE.
 
-require("zmq")
+local zmq = require"zmq"
 
-local ctx = zmq.init(1)
+local ctx = zmq.init()
 local s = ctx:socket(zmq.SUB)
 s:setopt(zmq.SUBSCRIBE, "")
 s:connect("tcp://localhost:5555")
 while true do
-    local msg = s:recv()
-    local msg_id = tonumber(msg)
-    if math.mod(msg_id, 10000) == 0 then print(msg_id) end
+	local msg = s:recv()
+	local msg_id = tonumber(msg)
+	if math.mod(msg_id, 10000) == 0 then print(msg_id) end
 end