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How to force cp to overwrite without confirmation
...u can do yes | cp -rf xxx yyy, but my gutfeeling says that if you do it as root - your .bashrc or .profile has an alias of cp to cp -i, most modern systems (primarily RH-derivatives) do that to root profiles.
You can check existing aliases by running alias at the command prompt, or which cp to che...
What is the fastest way to compute sin and cos together?
...nd be aware that using this method involves computing a power and a square root, so if performance is important, make sure to verify that this is actually faster than computing the other trig function directly.
– Tyler McHenry
Apr 21 '10 at 14:11
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Equation for testing if a point is inside a circle
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It may help some less math minded folks to see the square root operation used to measure distance compared against the radius. I realize that's not optimal, but as your answer is formatted more like an equation than code perhaps it makes more sense? Just a suggestion.
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Nginx — static file serving confusion with root & alias
...nswers to my confusions.
There is a very important difference between the root and the alias directives. This difference exists in the way the path specified in the root or the alias is processed.
In case of the root directive, full path is appended to the root including the location part, whereas...
Received fatal alert: handshake_failure through SSLHandshakeException
...certificate trust path between the certificate issued to the server, and a root CA. In most cases, this is because the root CA's certificate is absent in the trust store, leading to the situation where a certificate trust path cannot exist; the certificate is essentially untrusted by the client. Bro...
Why do I get access denied to data folder when using adb?
... want to browse everything on your device.
You need to have a phone with root access in order to browse the data folder on an Android phone. That means either you have a developer device (ADP1 or an ION from Google I/O) or you've found a way to 'root' your phone some other way.
You need to be runn...
Semicolons superfluous at the end of a line in shell scripts?
... on terminal or in shell script.
See the below examples:
On terminal:
[root@server test]# ls;pwd;
On shell script:
[root@server test]# cat test4.sh
echo "Current UserName:"
whoami
echo -e "\nCurrent Date:";date;
[root@server test]#
But I am not agree with the comment that & is equi...
Rails.env vs RAILS_ENV
...ewise, you can use RAILS_DEFAULT_LOGGER to get the current logger or RAILS_ROOT to get the path to the root folder.
Starting from Rails 2.x, Rails introduced the Rails module with some special methods:
Rails.root
Rails.env
Rails.logger
This isn't just a cosmetic change. The Rails module offers ...
Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
I want to create a database which does not exist through JDBC. Unlike MySQL, PostgreSQL does not support create if not exists syntax. What is the best way to accomplish this?
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How do I design a class in Python?
...ormat but could easily convert to other formats when outputting (Postgres, MySQL, MongoDB).
Now let's think through the Database object. What does this hide and store? Well clearly it can't store the full contents of the database, since that is why we have a database! So what is the point? The goal...