/usr/share/doc/lua-socket-dev/samples/daytimeclnt.lua is in lua-socket-dev 3.0~rc1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- UDP sample: daytime protocol client
-- LuaSocket sample files
-- Author: Diego Nehab
-----------------------------------------------------------------------------
local socket = require"socket"
host = host or "127.0.0.1"
port = port or 13
if arg then
host = arg[1] or host
port = arg[2] or port
end
host = socket.dns.toip(host)
udp = socket.udp()
print("Using host '" ..host.. "' and port " ..port.. "...")
udp:setpeername(host, port)
udp:settimeout(3)
sent, err = udp:send("anything")
if err then print(err) os.exit() end
dgram, err = udp:receive()
if not dgram then print(err) os.exit() end
io.write(dgram)
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