roberts
Group: Members
Posts: 4983
Joined: Oct. 2003 |
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Posted: Feb. 21 2007,14:52 |
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I have updated my Lua script so that the NIST timeserver can be specified and also the initial connection timeout defaults to 5 seconds but can be user specified as well.
| Code Sample | #! /bin/lua
--[[
This lua script based in part of the idea expressed in
the bash script from newOldUser of the damnsmall linux forums
by Robert Shingledecker - 2007/02/17
Usage: sudo gettime.lus {nist_time_server} {timeout-in-secs}
See: http://tf.nist.gov/service/its.htm
This script gets time information from an NIST time server
in universal time format. It then rearranges it into
the format that the date command uses MMDDhhmmCCYY.ss
and issues the date command.
An internet connection must be available
sample of returned information follows
54144 07-02-13 16:14:43 00 0 0 95.3 UTC(NIST) *
1---0----1----1----2----2----3----3----4----4----5
1---5----0----5----0----5----0----5----0----5----0
--]]
host = arg[1] or "time-nw.nist.gov"
port = 13
timeout = arg[2] or 5.00
target = {10,13,16,19,7,22}
date = ""
timeserver = socket.tcp()
timeserver:settimeout(timeout)
_,err = timeserver:connect(host,port)
if err then
print("Could not connect "..err)
os.exit(1)
end
_,err = timeserver:send("anything\n")
if err then
print("Error in sending "..err)
os.exit(1)
end
print("Requesting time from: "..host)
timeserver:settimeout(0.50)
while 1 do
line,err = timeserver:receive('*l')
if err then
print("Error in receiving "..err)
os.exit(1)
end
if string.find(line,"UTC") then
for i = 1, 6 do
if i == 5 then date = date .. "20" end
if i == 6 then date = date .. "." end
date = date .. string.sub(line,target[i],target[i]+1)
end
os.execute("date -u "..date)
os.exit(0)
end
end
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Please choose a timeserver nearest to you so that we all don't gang up on one. See the URL embedded for a list.
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