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How to detect idle time in JavaScript elegantly?

Is it possible to detect " idle " time in JavaScript? My primary use case probably would be to pre-fetch or preload content. ...
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How to paste over without overwriting register

Does anyone know of a way to paste over a visually selected area without having the selection placed in the default register? ...
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How to send commands when opening a tmux session inside another tmux session?

A typical situation may be: 3 Answers 3 ...
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How best to determine if an argument is not sent to the JavaScript function

I have now seen 2 methods for determining if an argument has been passed to a JavaScript function. I'm wondering if one method is better than the other or if one is just bad to use? ...
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What's the difference between Sender, From and Return-Path?

What's the difference between an email Sender, From and Return-Path value? 3 Answers 3...
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Designing function f(f(n)) == -n

A question I got on my last interview: 118 Answers 118 ...
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How to run a command before a Bash script exits?

If a Bash script has set -e , and a command in the script returns an error, how can I do some cleanup before the script exits? ...
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Subdomain on different host [closed]

I'm trying to host a subdomain for my site with a different hosting company and I'm running into issues on how to set it up. ...
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What is the best django model field to use to represent a US dollar amount?

I need to store a U.S. $ dollar amount in a field of a Django model. What is the best model field type to use? I need to be able to have the user enter this value (with error checking, only want a number accurate to cents), format it for output to users in different places, and use it to calculate...
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Test if remote TCP port is open from a shell script

I'm looking for a quick and simple method for properly testing if a given TCP port is open on a remote server, from inside a Shell script. ...