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SQL select join: is it possible to prefix all columns as 'prefix.*'?
...column to separate each new table. This works especially well if you're looping through a result set for a list of columns in a scripting language such as Python or PHP.
SELECT '' as table1_dummy, table1.*, '' as table2_dummy, table2.*, '' as table3_dummy, table3.* FROM table1
JOIN table2 ON table2...
How to test an Internet connection with bash?
How can an internet connection be tested without pinging some website?
I mean, what if there is a connection but the site is down? Is there a check for a connection with the world?
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Preferred Java way to ping an HTTP URL for availability
... that's not the topic here. The question is: What is the preferred way to ping a URL in java?
6 Answers
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java.net.UnknownHostException: Invalid hostname for server: local
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I was having the same issue on my mac. I found the issue when I pinged my $HOSTNAME from terminal and it returned ping: cannot resolve myHostName: Unknown host.
To resolve:
Do echo $HOSTNAME on your terminal.
Whatever hostname it shows (lets say myHostName), try to ping it : ping myHo...
How do the major C# DI/IoC frameworks compare? [closed]
At the risk of stepping into holy war territory, What are the strengths and weaknesses of these popular DI/IoC frameworks, and could one easily be considered the best? ..:
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Android check internet connection [duplicate]
... you're on the internet. I'm looking into it further but you might have to ping a server on the internet to make sure you're actually on the internet.
– miguel
Jan 31 '14 at 1:42
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What is the difference between CMD and ENTRYPOINT in a Dockerfile?
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For example, if your Dockerfile is:
FROM debian:wheezy
ENTRYPOINT ["/bin/ping"]
CMD ["localhost"]
Running the image without any argument will ping the localhost:
$ docker run -it test
PING localhost (127.0.0.1): 48 data bytes
56 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.096 ms
56 bytes fro...
How to kill a child process after a given timeout in Bash?
...lready installed otherwise use sudo apt-get install coreutils)
timeout 10 ping www.goooooogle.com
If you don't want to download something, do what timeout does internally:
( cmdpid=$BASHPID; (sleep 10; kill $cmdpid) & exec ping www.goooooogle.com )
In case that you want to do a timeout for...
Windows batch: sleep [duplicate]
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You can try
ping -n XXX 127.0.0.1 >nul
where XXX is the number of seconds to wait, plus one.
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How to make “if not true condition”?
..." did not work with /proc/mounts and trying to find out if a regularly dropping USB-disk was mounted on Raspbian 4.9 kernel. This one did the job perfectly!
– DocWeird
Nov 27 '19 at 12:51
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