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Add Keypair to existing EC2 instance
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Now, one your local machine chmod john to 600.
$ chmod 600 john
Step 5: time to test your key:
$ ssh -i john john@111.111.11.111
So, in this manner, you can setup multiple users to use one EC2 instance!!
share
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Usage of sys.stdout.flush() method
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Consider the following simple Python script:
import time
import sys
for i in range(5):
print(i),
#sys.stdout.flush()
time.sleep(1)
This is designed to print one number every second for five seconds, but if you run it as it is now (depending on your default syste...
Performance differences between debug and release builds
...olling. Loops with small bodies are improved by repeating the code up to 4 times in the body and looping less. Reduces the branch cost and improves the processor's super-scalar execution options.
Dead code elimination. A statement like if (false) { /.../ } gets completely eliminated. This can occ...
Understanding implicit in Scala
...leave the compiler to look for any valid candidate object to pass in every time it comes across a method call that requires an instance of the request. Since you do have a request available, all you need to do is to mark it as implicit.
You explicitly mark it as available for implicit use.
You hin...
What are the differences between Generics in C# and Java… and Templates in C++? [closed]
...piler is just putting List<Person> into the .NET dll file, but at runtime the JIT compiler goes and builds a new set of code, as if you had written a special list class just for containing people - something like ListOfPerson.
The benefit of this is that it makes it really fast. There's no ca...
What is the canonical way to check for errors using the CUDA runtime API?
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Probably the best way to check for errors in runtime API code is to define an assert style handler function and wrapper macro like this:
#define gpuErrchk(ans) { gpuAssert((ans), __FILE__, __LINE__); }
inline void gpuAssert(cudaError_t code, const char *file, int line, bo...
Where does Console.WriteLine go in ASP.NET?
... the back end like the javascript console at the front end. Saves heaps of time debugging, as opposed to using a file-based server log. You don't have to override "friendly" exception handling - keep the nice "oops" browser page, and just output the exception to the console, easy to see.
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Running a cron every 30 seconds
... duration to
# see what happens when the payload exceeds 30 seconds.
((maxtime = 20))
while [[ "$(date +%S)" != "00" ]]; do true; done
while true; do
# Start a background timer BEFORE the payload runs.
sleep 30 &
# Execute the payload, some random duration up to the limit.
# ...
“unmappable character for encoding” warning in Java
...AVA_TOOL_OPTIONS. If you set this variable to -Dfile.encoding=UTF8,
everytime a JVM is started, it will pick up this information.
Source: http://whatiscomingtomyhead.wordpress.com/2012/01/02/get-rid-of-unmappable-character-for-encoding-cp1252-once-and-for-all/
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Error pushing to GitHub - insufficient permission for adding an object to repository database
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This works only for some time in my case. I have to redo it after some pushes.
– BuZZ-dEE
Nov 27 '13 at 15:45
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