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All, Caveat: New user naivete to follow. I''m starting an application in Rails and I can''t use Gems. (There are legal implications in deploying unknown code here.) But Rails seems to have an extraordinary dependence on Gems. If I say ''rails PROJECT'', then the PROJECT directory gets created with supporting scripts, etc., but since they work internally

Hi, I'm currently writing my fourth book about Linux, for the french editor Eyrolles. The book will cover Linux server basics for pros, and it will be based on CentOS 7. I have a quick question to those of you who use either Windows 10 or Mac OS X as their everyday desktop system. How do you write a bootable CentOS USB disk using either Windows 10 or Mac OS X ? I've googled this, of

...I've been 100 % GNU/Linux since 2001, CentOS is running on my > workstation and on my laptop, and I'm simply writing the ISO file to a > USB stick using dd if=CentOS-XXXX.iso of=/dev/sdX. I tend to do the analogous thing on the mac, except for converting the image first: https://www.lewan.com/blog/2012/02/10/making-a-bootable-usb-stick-on-an-apple-mac-os-x-from-an-iso

I read from external data source containing several columns. Each column represents value of a metric. The columns are time series data. I want to sort the resulting dataframe such that the column with the largest mean is the leftmost column, descending in colMean values to the right. I see many solutions for sorting rows based on some column characteristic, but haven't found any