diff --git a/doc/socket.html b/doc/socket.html
index fec09c4..a99d71b 100644
--- a/doc/socket.html
+++ b/doc/socket.html
@@ -243,7 +243,9 @@ non-numeric indices) in the arrays will be silently ignored.
 
 <p class=return> The function returns a list with the sockets ready for
 reading, a list with the sockets ready for writing and an error message.
-The error message is "<tt>timeout</tt>" if a timeout condition was met and
+The error message is "<tt>timeout</tt>" if a timeout
+condition was met, "<tt>select failed</tt>" if the call
+to <tt>select</tt> failed, and
 <tt><b>nil</b></tt> otherwise. The returned tables are
 doubly keyed both by integers and also by the sockets
 themselves, to simplify the test if a specific socket has
@@ -251,7 +253,7 @@ changed status.
 </p>
 
 <p class=note>
-<b>Note: </b>: <tt>select</tt> can monitor a limited number
+<b>Note:</b> <tt>select</tt> can monitor a limited number
 of sockets, as defined by the constant <tt>socket._SETSIZE</tt>. This
 number may be as high as 1024 or as low as 64 by default,
 depending on the system. It is usually possible to change this
diff --git a/src/ftp.lua b/src/ftp.lua
index 917cd89..e0c3cae 100644
--- a/src/ftp.lua
+++ b/src/ftp.lua
@@ -271,8 +271,17 @@ _M.command = socket.protect(function(cmdt)
     local f = _M.open(cmdt.host, cmdt.port, cmdt.create)
     f:greet()
     f:login(cmdt.user, cmdt.password)
-    f.try(f.tp:command(cmdt.command, cmdt.argument))
-    if cmdt.check then f.try(f.tp:check(cmdt.check)) end
+    if type(cmdt.command) == "table" then
+        local argument = cmdt.argument or {}
+        local check = cmdt.check or {}
+        for i,cmd in ipairs(cmdt.command) do
+            f.try(f.tp:command(cmd, argument[i]))
+            if check[i] then f.try(f.tp:check(check[i])) end
+        end
+    else
+        f.try(f.tp:command(cmdt.command, cmdt.argument))
+        if cmdt.check then f.try(f.tp:check(cmdt.check)) end
+    end
     f:quit()
     return f:close()
 end)
@@ -282,4 +291,4 @@ _M.get = socket.protect(function(gett)
     else return tget(gett) end
 end)
 
-return _M
\ No newline at end of file
+return _M
diff --git a/src/ltn12.lua b/src/ltn12.lua
index dede0fa..575c5a7 100644
--- a/src/ltn12.lua
+++ b/src/ltn12.lua
@@ -22,6 +22,9 @@ _M.source = source
 _M.sink = sink
 _M.pump = pump
 
+local unpack = unpack or table.unpack
+local select = base.select
+
 -- 2048 seems to be better in windows...
 _M.BLOCKSIZE = 2048
 _M._VERSION = "LTN12 1.0.3"