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How do I use shell variables in an awk script?
...o it becomes a part of it.
If you want to make an awk that changes dynamically with use of variables, you can do it this way, but DO NOT use it for normal variables.
variable="line one\nline two"
awk 'BEGIN {print "'"$variable"'"}'
line one
line two
Here is an example of code injection:
variabl...
Modifying a subset of rows in a pandas dataframe
...on criteria, columns I want] = value
So Bren's answer is saying 'find me all the places where df.A == 0, select column B and set it to np.nan'
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Interface or an Abstract Class: which one to use?
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I was trying all day to understand the usages of abstract and interface classes, your post made it all clear. Thanks a lot Alan
– afarazit
May 21 '11 at 12:51
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Why would I make() or new()?
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Go has multiple ways of memory allocation and value initialization:
&T{...}, &someLocalVar, new, make
Allocation can also happen when creating composite literals.
new can be used to allocate values such as integers, &int is illegal:
new(P...
Execute a command line binary with Node.js
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For even newer version of Node.js (v8.1.4), the events and calls are similar or identical to older versions, but it's encouraged to use the standard newer language features. Examples:
For buffered, non-stream formatted output (you get it all at once), use child_process.exec:
const {...
pyplot scatter plot marker size
...This can be a somewhat confusing way of defining the size but you are basically specifying the area of the marker. This means, to double the width (or height) of the marker you need to increase s by a factor of 4. [because A = WH => (2W)(2H)=4A]
There is a reason, however, that the size of mark...
How do you reverse a string in place in JavaScript?
... might want to consider this answer instead.
[...s] is Unicode aware, a small edit gives:-
function reverse(s){
return [...s].reverse().join("");
}
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How do you find the sum of all the numbers in an array in Java?
I'm having a problem finding the sum of all of the integers in an array in Java. I cannot find any useful method in the Math class for this.
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right click context menu for datagridview
...text Menu key).
Cell selection on right mouse click has to be handled manually. Showing the context menu does not need to be handled as this is handled by the UI.
This completely mimics the approach used by Microsoft Excel. If a cell is part of a selected range, the cell selection doesn't change a...
Retaining file permissions with Git
...ere was a major distraction for me. It put me off the answer entirely, actually. (I don't have difficulty pulling repo from server.) @omid-ariyan's answer below with pre/post commit hooks was much more understandable. Later I realized that those hook scripts are doing exact same work as git-cache-...