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How to find Unused Amazon EC2 Security groups
I'm try to find a way to determine orphan security groups so I can clean up and get rid of them. Does anyone know of a way to discover unused security groups.
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What's the difference between “groups” and “captures” in .NET regular expressions?
I'm a little fuzzy on what the difference between a "group" and a "capture" are when it comes to .NET's regular expression language. Consider the following C# code:
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What is a non-capturing group in regular expressions?
How are non-capturing groups, i.e. (?:) , used in regular expressions and what are they good for?
15 Answers
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Group vs role (Any real difference?)
Can anyone tell me, what's the real difference between group and role? I've been trying to figure this out for some time now and the more information I read, the more I get the sense that this is brought up just to confuse people and there is no real difference. Both can do the other's job. I've alw...
In Django, how do I check if a user is in a certain group?
I created a custom group in Django's admin site.
12 Answers
12
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How do I use itertools.groupby()?
...d an understandable explanation of how to actually use Python's itertools.groupby() function. What I'm trying to do is this:
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Java regex capturing groups indexes
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Capturing and grouping
Capturing group (pattern) creates a group that has capturing property.
A related one that you might often see (and use) is (?:pattern), which creates a group without capturing property, hence named non-capturing g...
Using group by on multiple columns
I understand the point of GROUP BY x .
2 Answers
2
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Waiting until two async blocks are executed before starting another block
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Use dispatch groups: see here for an example, "Waiting on Groups of Queued Tasks" in the "Dispatch Queues" chapter of Apple's iOS Developer Library's Concurrency Programming Guide
Your example could look something like this:
dispatch_gr...
How to list all users in a Linux group?
How do I list all members of a group in Linux (and possibly other unices)?
20 Answers
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