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Running a cron every 30 seconds
... not go down to sub-minute resolutions, you will need to find another way.
One possibility, though it's a bit of a kludge(a), is to have two jobs, one offset by 30 seconds:
# Need these to run on 30-sec boundaries, keep commands in sync.
* * * * * /path/to/executable param1 param2
* * *...
How to join two sets in one line without using “|”
...some cases), you can use set.update():
S.update(T)
The return value is None, but S will be updated to be the union of the original S and T.
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jQuery hasClass() - check for more than one class
...ements that have both classes. I think Marcel is looking for elements with one or more of a number of classes.
– Giles Van Gruisen
Feb 6 '10 at 22:19
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When to use static vs instantiated classes
... a life on its own)
(Yeah, I admit, really really overly-simplified...)
One thing about static methods/classes is that they don't facilitate unit testing (at least in PHP, but probably in other languages too).
Another thing about static data is that only one instance of it exists in your program...
How are ssl certificates verified?
...he certificate authority that the address listed in the certificate is the one to which it has an open connection.
Your web browser generates a shared symmetric key which will be used to encrypt the HTTP traffic on this connection; this is much more efficient than using public/private key encryption...
Git and Mercurial - Compare and Contrast
...an two parents), nor tagging non-commit objects.
Tags: Mercurial uses versioned .hgtags file with special rules for per-repository tags, and has also support for local tags in .hg/localtags; in Git tags are refs residing in refs/tags/ namespace, and by default are autofollowed on fetching and requir...
Find running median from a stream of integers
...solution works is explained below:
For the first two elements add smaller one to the maxHeap on the left, and bigger one to the minHeap on the right. Then process stream data one by one,
Step 1: Add next item to one of the heaps
if next item is smaller than maxHeap root add it to maxHeap,
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Command substitution: backticks or dollar sign / paren enclosed? [duplicate]
..., in general, they are interchangeable, apart from the exceptions you mentioned for escaped characters. However, I don't know and cannot say whether all modern shells and all modern *nixes support both forms. I doubt that they do, especially older shells/older *nixes. If I were you, I wouldn't depen...
What are the pros and cons of performing calculations in sql vs. in your application
...t the db server will save bandwidth, and disk io if the aggregates can be done inside indexes)
convenience (sql is not the best language for complex work - especially not great for procedural work, but very good for set-based work; lousy error-handling, though)
As always, if you do bring the data ...
How to squash all git commits into one?
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@Pred Don’t use squash for all commits. The very first one needs to be pick.
– Geert
Jan 5 '15 at 14:38
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