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Why is $$ returning the same id as the parent process?
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$$ is defined to return the process ID of the parent in a subshell; from the man page under "Special Parameters":
$ Expands to the process ID of the shell. In a () subshell, it expands to the process ID of the current shell,...
Compare if two variables reference the same object in python
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In the example, x is z returns False. But if x and z are assigned the same values instead of lists (for example x, z = 13, 13) then x is z returns True. Why is that?
– Bill
Dec 13 '15 ...
Flask-SQLAlchemy how to delete all rows in a single table
How do I delete all rows in a single table using Flask-SQLAlchemy?
3 Answers
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How can I get clickable hyperlinks in AlertDialog from a string resource?
What I am trying to accomplish is to have clickable hyperlinks in the message text displayed by an AlertDialog . While the AlertDialog implementation happily underlines and colors any hyperlinks (defined using <a href="..."> in the string resource passed to Builder.setMessage ) supplied ...
How to determine if Javascript array contains an object with an attribute that equals a given value?
...This answer is from 2011, before browsers had widely supported array filtering methods and arrow functions. Have a look at CAFxX's answer.
There is no "magic" way to check for something in an array without a loop. Even if you use some function, the function itself will use a loop. What you can do i...
MySQL order by before group by
There are plenty of similar questions to be found on here but I don't think that any answer the question adequately.
9 Answ...
Alter a MySQL column to be AUTO_INCREMENT
I’m trying to modify a table to make its primary key column AUTO_INCREMENT after the fact. I have tried the following SQL, but got a syntax error notification.
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MySQL Data - Best way to implement paging?
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From the MySQL documentation:
The LIMIT clause can be used to constrain the number of rows returned by the SELECT statement. LIMIT takes one or two numeric arguments, which must both be nonnegative integer constants (except when using prepared statements).
With two arguments, the first argumen...
What is the difference between a Docker image and a container?
When using Docker, we start with a base image. We boot it up, create changes and those changes are saved in layers forming another image.
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Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the la
Why is this line needed in xml layout file?
12 Answers
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