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How to list all users in a Linux group?
...ing, you will miss users who have that group as their primary group and anyone who has been added to that group via a mechanism other than UNIX flat files (i.e. LDAP, NIS, pam-pgsql, etc.).
If I absolutely had to do this myself, I'd probably do it in reverse: use id to get the groups of every user ...
TypeError: method() takes 1 positional argument but 2 were given
... as you can see, does indeed have two arguments - it's just that the first one is implicit, from the point of view of the caller.
This is because most methods do some work with the object they're called on, so there needs to be some way for that object to be referred to inside the method. By conven...
How to get thread id from a thread pool?
... that I submit tasks to (limited to 5 threads). How can I find out which one of those 5 threads executes my task (something like "thread #3 of 5 is doing this task")?
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What is the most efficient Java Collections library? [closed]
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@Andreas: Can't say I agree. Not that it's a "one or the other" scenario - I use the regular collections (with helpers like the Lists class) and then use Iterables etc when I need to. Use the complexity only when it helps you.
– Jon Skeet
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Different types of thread-safe Sets in Java
...y. This means that no two methods of the set can be executed concurrently (one will block until the other finishes) - this is thread-safe, but you will not have concurrency if multiple threads are really using the set. If you use the iterator, you usually still need to synchronize externally to avoi...
When would you use delegates in C#? [closed]
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Delegates are very useful for many purposes.
One such purpose is to use them for filtering sequences of data. In this instance you would use a predicate delegate which accepts one argument and returns true or false depending on the implementation of the delegate itself...
Rails: How does the respond_to block work?
...mental than some of the answers I found here. This may or may not help someone.
respond_to is a method on the superclass ActionController.
it takes a block, which is like a delegate. The block is from do until end, with |format| as an argument to the block.
respond_to executes your block, passing ...
When would you use the different git merge strategies?
...e is the default for non-fast-forward merges. We're all familiar with that one.
Octopus
I've used octopus when I've had several trees that needed to be merged. You see this in larger projects where many branches have had independent development and it's all ready to come together into a single he...
Force overwrite of local file with what's in origin repo?
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If you want to overwrite only one file:
git fetch
git checkout origin/master <filepath>
If you want to overwrite all changed files:
git fetch
git reset --hard origin/master
(This assumes that you're working on master locally and you want the c...
What is 'Pattern Matching' in functional languages?
...ut functional programming and I've noticed that Pattern Matching is mentioned in many articles as one of the core features of functional languages.
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