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How to echo shell commands as they are executed
In a shell script, how do I echo all shell commands called and expand any variable names?
13 Answers
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Looking for simple Java in-memory cache [closed]
...kedHashMap isn't good enough), and which can be serialized to disk periodically.
9 Answers
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I lost my .keystore file?
...ed. So, there is no other way: you should issue another application.
Generally, the only advise that exists on keystores: "always back it up!"
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C++ Singleton design pattern
... design pattern that is lazy-evaluated, guaranteed-destruction, not-technically-thread-safe:
Can any one provide me a sample of Singleton in c++?
Here is an updated C++11 implementation of the Singleton design pattern that is lazy-evaluated, correctly-destroyed, and thread-safe.
class S
{
pu...
Debugging with command-line parameters in Visual Studio
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Spot on. But apparently in VS2017 it's not called "Debugging", but "Debug". We may never know why.
– OmarL
Oct 16 '17 at 14:43
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Hibernate vs JPA vs JDO - pros and cons of each? [closed]
... other advantage of JDO/DataNucleus over hibernate is that it doesn't have all the run time reflection overhead and is more memory efficient because it uses build time byte code enhancement (maybe add 1 sec to your build time for a large project) rather than hibernate's run time reflection powered p...
Has reCaptcha been cracked / hacked / OCR'd / defeated / broken? [closed]
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I notice that almost all the answers here relate to the ineffectiveness of the concept of CAPTCHA, in principle - and while I very much agree with them, in fact gave a talk at OWASP a few months ago explaining just that - the question is very spe...
MySQL: Insert record if not exists in table
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I'm not actually suggesting that you do this, as the UNIQUE index as suggested by Piskvor and others is a far better way to do it, but you can actually do what you were attempting:
CREATE TABLE `table_listnames` (
`id` int(11) NOT NUL...
Multiple arguments vs. options object
...bject to a function instead of passing a long list of parameters, but it really depends on the exact context.
I use code readability as the litmus test.
For instance, if I have this function call:
checkStringLength(inputStr, 10);
I think that code is quite readable the way it is and passing ind...
How to match “anything up until this sequence of characters” in a regular expression?
... of .+ (one or more of
anything). When we use .+, the engine will basically match everything.
Then, if there is something else in the regex it will go back in steps
trying to match the following part. This is the greedy behavior,
meaning as much as possible to satisfy.
When using .+?, in...