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Delete all files in directory (but not directory) - one liner solution
I want to delete all files inside ABC directory.
11 Answers
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How to sum all column values in multi-dimensional array?
How can I add all the columnar values by associative key? Note that key sets are dynamic.
20 Answers
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Get names of all files from a folder with Ruby
I want to get all file names from a folder using Ruby.
19 Answers
19
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How to join (merge) data frames (inner, outer, left, right)
...nner join: merge(df1, df2) will work for these examples because R automatically joins the frames by common variable names, but you would most likely want to specify merge(df1, df2, by = "CustomerId") to make sure that you were matching on only the fields you desired. You can also use the by.x and b...
At runtime, find all classes in a Java application that extend a base class
...is helpful link to the great package "org.reflections"! With that I've finally found a practicable and neat solution for my problem.
– Hartmut P.
Jul 7 '15 at 13:15
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Deleting all pending tasks in celery / rabbitmq
How can I delete all pending tasks without knowing the task_id for each task?
9 Answers
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In plain English, what does “git reset” do?
...master)
You've ended up in a detached HEAD state. HEAD, work tree, index all match B, but the master branch was left behind at C. If you make a new commit D at this point, you'll get this, which is probably not what you want:
- A - B - C (master)
\
D (HEAD)
Remember, reset doesn'...
What does $@ mean in a shell script?
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$@ is all of the parameters passed to the script.
For instance, if you call ./someScript.sh foo bar then $@ will be equal to foo bar.
If you do:
./someScript.sh foo bar
and then inside someScript.sh reference:
umbrella_corp_...
What is polymorphism, what is it for, and how is it used?
...erate on different data types.
The classic example is the Shape class and all the classes that can inherit from it (square, circle, dodecahedron, irregular polygon, splat and so on).
With polymorphism, each of these classes will have different underlying data. A point shape needs only two co-ordin...
How to remove all callbacks from a Handler?
I have a Handler from my sub-Activity that was called by the main Activity . This Handler is used by sub-classes to postDelay some Runnables, and I can't manage them. Now, in the onStop event, I need to remove them before finishing the Activity (somehow I called finish() , but it still call ...