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What is the meaning and difference between subject, user and principal?
...plication you are the subject and the application is the object. When someone knocks on your door the visitor is the subject requesting access and your home is the object access is requested of.
Principal - A subset of subject that is represented by an account, role or other unique identifier. Whe...
How to add a button to UINavigationBar?
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UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"Done"
style:UIBarButtonItemStyleDone target:nil action:nil];
UINavigationItem *item = [[UINavigationItem alloc] initWithTitle:@"Title"];
item.rightBarButtonItem = rightButton;
item.hidesBackButton = YES;
[bar pushNavigati...
How accurately should I store latitude and longitude?
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Actually, equator is best case. One latitude and one longitude degree are the same size at the equator (69 miles), but one degree of longitude shrinks to zero as it approaches either of the poles. Here's a very nice explanation: nationalatlas.gov/articles/m...
In practice, what are the main uses for the new “yield from” syntax in Python 3.3?
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Let's get one thing out of the way first. The explanation that yield from g is equivalent to for v in g: yield v does not even begin to do justice to what yield from is all about. Because, let's face it, if all yield from does is expan...
SQL statement to select all rows from previous day
...ing for a good SQL Statement to select all rows from the previous day from one table. The table holds one datetime column. I am using SQL Server 2005.
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What is the most ridiculous pessimization you've seen? [closed]
... to unreadable/unmaintainable code. Even worse is pessimization, when someone implements an "optimization" because they think it will be faster, but it ends up being slower, as well as being buggy, unmaintainable, etc. What is the most ridiculous example of this that you've seen?
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How do you find the row count for all your tables in Postgres
...to find the row count for all my tables in Postgres. I know I can do this one table at a time with:
15 Answers
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Bash function to find newest file matching pattern
...or file in "$dir"/*; do
[[ $file -nt $latest ]] && latest=$file
done
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How do I use sudo to redirect output to a location I don't have permission to write to?
I've been given sudo access on one of our development RedHat linux boxes, and I seem to find myself quite often needing to redirect output to a location I don't normally have write access to.
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HTTP 1.0 vs 1.1
... 1.0 does not officially require a Host header, but it doesn't hurt to add one, and many applications (proxies) expect to see the Host header regardless of the protocol version.
Example:
GET / HTTP/1.1
Host: www.blahblahblahblah.com
This header is useful because it allows you to route a message ...