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How to find Unused Amazon EC2 Security groups
...upId' --output text | tr '\t' '\n' | sort | uniq
Then put it together and compare the 2 lists and see what's not being used from the master list:
comm -23 <(aws ec2 describe-security-groups --query 'SecurityGroups[*].GroupId' --output text | tr '\t' '\n'| sort) <(aws ec2 describe-instances ...
In Java, when should I create a checked exception, and when should it be a runtime exception? [dupli
...xceptions being forgotten until they showed up in production (on agedwards.com), so we resolved to use checked exceptions exclusively.
At my current job, I find that there are many who are for Runtime exceptions in many or all cases.
Here's what I think: Using CheckedExceptions, I am forced at co...
To ARC or not to ARC? What are the pros and cons? [closed]
...old code. It is not garbage collection. It has no GC runtime overhead. The compiler inserts retains and releases in all the places you should have anyway. But it's smarter than you and can optimize out the ones that aren't actually needed (just like it can unroll loops, eliminate temporary variables...
Does JavaScript have the interface type (such as Java's 'interface')?
...allegedly only works on host objects (that is, DOM elements and such). If compatibility is an issue, you can't use .defineProperty. (I won't even mention IE6, because it's rather irrelevant anymore outside of China.)
Another issue is that some coding styles like to assume that everyone writes bad...
Named Branches vs Multiple Repositories
...med branches the branch name is embedded in each changeset and will thus become an immutable part of the history. With clones there will be no permanent record of where a particular changeset came from.
This means that clones are great for quick experiments where you don't want to record a branch n...
How can I auto-elevate my batch file, so that it requests from UAC administrator rights if required?
...rms only if there's an Access Denied error?
Or, you could simply have the commands for the xcopy and reg.exe always be run with psexec -h, but it would be annoying for the end-user if they need to input their password each time (or insecure if you included the password in the script)...
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How to print out the contents of a vector?
... << *i << ' ';
But the type of i will be non-const (i.e., the compiler will use std::vector<char>::iterator as the type of i).
In this case, you might as well just use a typedef, which also brings with it its own benefits (which I won't expound upon here):
typedef std::vector<c...
What is dynamic programming? [closed]
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I wouldn't say "easier", but faster. A common misunderstanding is that dp solves problems that naive algorithms can't and that isn't the case. Is not a matter of functionality but of performance.
– andandandand
Jun 30 '09 at ...
How do you change Background for a Button MouseOver in WPF?
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Good example of livelock?
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what should we do to overcome the problem of livelock in this particular example?
– Thor
Feb 17 '16 at 11:25
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