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Shell script - remove first and last quote (") from a variable
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@jsears Huh? This specifically trims one from the start if there is one, and one from the end if there is one. If you don't want to remove unless both are present; yes, a single sed regex could be used, or the variable substitution could be wrapped i...
How to stop creating .DS_Store on Mac? [closed]
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Please install http://asepsis.binaryage.com/ and then reboot your mac.
ASEPSIS redirect all .DS_Store on your mac to /usr/local/.dscage
After that, You could delete recursively all .DS_Store from your mac.
find ~ -name ".DS_Store" -d...
Has reCaptcha been cracked / hacked / OCR'd / defeated / broken? [closed]
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I notice that almost all the answers here relate to the ineffectiveness of the concept of CAPTCHA, in principle - and while I very much agree with them, in fact gave a talk at OWASP a few months ago explaining just that - the question is very spe...
What does the construct x = x || y mean?
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It means the title argument is optional. So if you call the method with no arguments it will use a default value of "Error".
It's shorthand for writing:
if (!title) {
title = "Error";
}
This kind of shorthand trick with boolean expressions is common in Perl too. With the...
Grepping a huge file (80GB) any way to speed it up?
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Here are a few options:
1) Prefix your grep command with LC_ALL=C to use the C locale instead of UTF-8.
2) Use fgrep because you're searching for a fixed string, not a regular expression.
3) Remove the -i option, if you don't need it.
So your command becomes:
LC_ALL=C fgrep -A 5 -...
Why does Unicorn need to be deployed together with Nginx?
... application servers. They also know how to handle caching and are good at allowing concurrent file downloads while still taking in traffic and passing it to the application servers.
– Pratik
Jan 5 '12 at 9:28
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Setting direction for UISwipeGestureRecognizer
...ple swipe gesture recognition to my view based iPhone project. Gestures in all directions (right, down, left, up) should be recognized.
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How to add pandas data to an existing csv file?
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Thanks for the answer. This will allow me append new df on row-wise. But could you let me know how can I append the new df on column-wise?
– datanew
Nov 9 '18 at 21:30
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LINQ - Left Join, Group By, and Count
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.Count() will generate COUNT(*) which will count all the rows in that group, by the way.
– Mehrdad Afshari
Mar 29 '09 at 22:47
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Why must a nonlinear activation function be used in a backpropagation neural network? [closed]
...ion function is to introduce non-linearity into the network
in turn, this allows you to model a response variable (aka target variable, class label, or score) that varies non-linearly with its explanatory variables
non-linear means that the output cannot be reproduced from a linear combination of ...