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The worst December for the US stock market |
Listen this article |
The main financial indices fell dramatically again, helping to complete a fatal month for the stock market and its investors |
The worst December for the US stock market |
For investors and analysts, the financial landscape in the United States is full of uncertainty. Concern that resulted in a widespread collapse of the indices that measure the performance of the shares traded there, the last in what has been a difficult last quarter of the year, which culminated in the worst month of D... |
Leer en español: El peor diciembre para la bolsa de EE.UU. |
Perhaps the first concern of investors is the threat of a possible closure of the government in the United States, product of the financing plan proposed by Donald Trump to comply with the construction of the wall on the border with Mexico. |
The conflict between the Republican and Democratic sides in the Senate led to threats of closure, where Trump declared he would be proud to close the government in the search for greater border security. However, he did not take any risks, and ended up signing a temporary agreement yesterday to finance the government t... |
Although the crisis was avoided, the situation in the United States Congress worries investors, particularly because the bill that causes the controversy has to do with the state budget. In a second place, the loss of investor confidence also arises from the actions of the Federal Reserve (Fed) of the United States. |
This week the Fed raised interest rates again, for the fourth time in the year, which are now around 2.25% to 2.5%. Many investors have referred to the actions of the Fed as 'hawkish', an adjective that describes an attitude that puts the soundness of public finances above the welfare of the markets. This worries inves... |
Read also: The world's stock exchanges fell: Do you know how much and why? |
"By ignoring turbulence in the financial markets and focusing on economic strength, Powell (President of the Federal Reserve) told the markets that the Federal Reserve will not be willing to modify monetary policy to support the prices of the assets in question. the stock market", said Brad McMillan, chief investor for... |
LatinAmerican Post | Pedro Bernal |
Translated from "El peor diciembre para la bolsa de EE.UU." |
Grim's Reapers - Registration |
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Latest Experiences in Linux |
While the Python web service running on Werkzeug has been performing fantastically for development purposes someone has managed to crash the server a few times since I've made it publicly available. I'm not entirely sure if this is an issue* with Werkzeug or my code. I use the term "issue" loosely since the approach I'... |
Remembering that one Command |
One convenient trick I've learned in the midst of everything else is that Linux allows you to not only iterate through your previous commands but search them as well. By this time my command history has gotten fairly large so it's really helpful when I can't quite remember how I got a command to work the last time. To ... |
Transmission Logging |
I decided I want to try to log all the packets coming and going from the service so I searched Google to see what people were recommending. At first glance netcat seemed to be capable of doing just that. An article over at hawk host gives an example of the command to set up the proxy as well as a great explanation of w... |
mkfifo pipe |
nc -l -p 80 < pipe | tee outgoing.log | nc server 8000 | tee pipe incoming.log |
Before I could use this command I had to remove the redirect I when I created the lightweight application server. In order to remove this you first need to take a look at the table. You can use the following command. |
And your output should look something like this. |
num target prot opt source destination |
1 REDIRECT tcp -- tcp dpt:80 redir ports 8000 |
Chain INPUT (policy ACCEPT) |
num target prot opt source destination |
Chain OUTPUT (policy ACCEPT) |
num target prot opt source destination |
num target prot opt source destination |
In my case I only had one entry in the PREROUTING chain so I wanted to remove rule number 1. |
iptables -t nat -D PREROUTING 1 |
Now that the redirect was out of the way I could try out my netcat proxy command. |
Testing Services from the Command Line |
At some point during all this testing I was getting pretty tired of switching back and forth between my PuTTy session and my browser. I had already managed to log one of the requests to the service into a file. |
GET /Service/GetApplication?name=passport HTTP/1.1 |
Connection: keep-alive |
Cache-Control: max-age=0 |
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36 |
Accept-Encoding: gzip,deflate,sdch |
It occured to me that it was most likely possible to send this request straight from the command line. Surprisingly it was a simple cat command in combination with another nifty feature of Linux. |
cat application.request > /dev/tcp/localhost/80 |
Piece of cake. The only drawback to this approach was that no output would be returned. In order to see that I'd have to use netcat in combination with the cat command. |
cat application.request | netcat localhost 80 |
Again, fairly simple stuff. So how well did this work as a logging solution? The good news is that the requests were logged but the bad news was that netcat would stop listening after the first connection. While it turns out that there is a -k option which keeps netcat listening this only occurs after the current conne... |
In the course of all my previous research I remembered seeing a link for an application called tcpserver which is a part of the ucspi-tcp package. I recommend installing the package as it has a number of other utilities that seem like they would be incredibly useful. |
tcpserver waits for connections from TCP clients. For each connection, it runs prog, with descriptor 0 reading from the network and descriptor 1 writing to the network. |
Great! Let's try a simple approach. |
tcpserver 0 80 nc localhost 8000 |
This works but I immediately noticed a slight connection delay and occasionally the request would fail on a browser. I'm not entirely sure what the cause is. That said I still wanted to see if I could get the logging working. |
tcpserver 0 80 tee logs/client.log | nc localhost 8000 | tee logs/server.log |
Unfortunately this just seems to spin indefinitely and once the server is shut down the browser ends up showing it's own request so somewhere in this command wires are crossed. I was able to get mixed results by writing a bash script instead. |
Remember we need to make it executable |
chmod 755 myscript |
And then run it with tcpserver |
tcpserver 0 80 ./myscript |
I'm still working on understanding why the script functions but not the command but the bigger issue was that my log files were getting overwritten so I needed |
date=$(date +%Y%m%d) |
client_count=$(ls -l logs/client.$date.* | grep ^- | wc -l) |
count=$(ls -l logs/server.$date.* | grep ^- | wc -l) |
if [ $client_count -gt $count ] ; then count=$client_count ; fi |
tee logs/client.$date.$count.log | nc localhost 8000 | tee logs/server.$date.$count.log |
When I run this and use cat to issue commands everything seems to work fine but I believe there are some concurrency issues when a browser hits the service. Ultimately I'm beginning to realize I've gone down a rabbit hole that's far off base from my original purpose so I believe I'll end things here and switch to anoth... |
Packet Sniffing |
Rather than try to stand in between the communications an easier (and most likely safer) alternative would be to just run a packet sniffer. I'm still researching the various tools that Linux has available and I'll be writing more on my findings. |
While it's unfortunate that the logging approach didn't work out I did gain a better understanding of Linux standard inputs and outputs as well as a few other neat tricks along the way. |
2 Replies Latest reply on Oct 6, 2018 10:52 AM by Ritesh Bisht |
How a Window_Sum or Window_AVG function works |
siva Nageswara Rao |
How does a window_Sum or Window_Avg function will help us to make the some calculation static that means the calculation field which has been generated by using the these function will not be changed even though we modify filter conditions. |
Thanks in advance. |
back to article Autodesk to release 'open' 3D printer |
Design software specialist Autodesk is taking a step into the wonderful world of hardware, after announcing it intends to released a 3D printer. CEO and president Carl Bass has blogged about the new device, to be called the “Spark”, and explains that the company is trying to get the computer-aided design community enth... |
This topic is closed for new posts. |
1. Anonymous Coward |
Anonymous Coward |
Lets see what their definition of "Open" is first... |
From their blog about it: |
"Spark will be open and freely licensable ..." |
"Freely licensable" sounds like mealy mouth words meaning "not open". Hopefully I'm wrong, and it's truly open (eg for modification, derivatives, etc). |
2. P. Lee Silver badge |
Will my local printer work if my internet link is down? |
1. billse10 |
Re: Question! |
at least it's not from Brother .. telling them what you've made / printed and crashing your machine if you try to disable that .... |
3. raving angry loony |
Autodesk newspeak strikes again. |
Autodesk - that paragon of closed, proprietary, lock-in tech that goes out of its way to buy up and close down anything that might compete - is about as likely to release anything "open" as I am to become Patriarch of the Orthodox Church. I suggest that the headline writer and whoever wrote this drivel have fallen ... |
1. Dave 126 Silver badge |
Re: Autodesk newspeak strikes again. |
Possibly, but their is such a thing as blind cynicism, just as there is blind naivety. |
You sem to be suggesting that Autodesk are hoping to buy up and close down several competing open source projects.... that can't happen. |
Autodesk make their money by renting out their software by the year, across architectural, engineering and design disciplines. This software becomes more useful if it can be used to output to 3D printers. Currently 3rd party software, open source or proprietary, is required to generate Gcode or equivilent from wh... |
Autodesk, will want to drive rentals of their pricey software by releasing an alternative to the current open source software (principally, SkeinForge and Slic3r). Autodesk will benefit more from this model than trying to sell 'slicing' software to users. That adoption won't happen if Autodesk's offerings are sub... |
Autodesk's real competitors are big enough to look after themselves. |
4. Anonymous Coward |
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