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2011-03-12 - Confoo 2011 presentation
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Get the time from NIST.GOV

Terminal - Get the time from NIST.GOV
cat </dev/tcp/time.nist.gov/13
2009-12-03 21:40:14
User: drewk
Functions: cat
Get the time from NIST.GOV


and is explained more fully here: http://tf.nist.gov/service/acts.htm


There are 2 alternatives - vote for the best!

Terminal - Alternatives

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What others think

I don't get it to work with bash. What are the prerequisites ?

Comment by CodSpirit 281 weeks and 3 days ago

CodSpirit: On some systems, such as Debian and Debian offshoots, net redirections aren't enabled in Bash. You can do the same thing with curl, wget, or nc, though:

curl -s time.nist.gov:13 nc time.nist.gov 13 wget -q -O- time.nist.gov:13
Comment by eightmillion 281 weeks and 3 days ago

You have to enable net-redirections when compiling bash to do it.

That doesn't work on debian derivated distros by default...

Comment by sputnick 281 weeks and 3 days ago

Works for me on Ubuntu and OS X. I do not have Debian...

Comment by drewk 281 weeks and 2 days ago

Indeed it is not enabled on Ubuntu 9.04

Thanks eightmillion for alternatives

Comment by CodSpirit 281 weeks and 2 days ago

To convert to local time, you can use the date command, thus the full command will be:

wget -q -O- time.nist.gov:13 | awk '{print $2,$3}' | grep -v "^ *$" | (read t; date "+%Y-%m-%d %H:%M:%S %Z" -d "$t +0000")

(if it needs explaining, we get the date portion, skip empty line, read into variable t, then use date to print in local time)

Comment by Uriqimadh 48 weeks and 3 days ago

Your point of view

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