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Sleep until a specific time/date
...do the following:
current_epoch=$(date +%s)
target_epoch=$(date -d '01/01/2010 12:00' +%s)
sleep_seconds=$(( $target_epoch - $current_epoch ))
sleep $sleep_seconds
To add precision down to nanoseconds (effectively more around milliseconds) use e.g. this syntax:
current_epoch=$(date +%s.%N)
tar...
How to do a FULL OUTER JOIN in MySQL?
...e SAMPLE transcribed from this SO question you have:
with two tables t1, t2:
SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
The query above works for special cases where a FULL OUTER JOIN operation would not produce any duplicate rows. The ...
Why do we check up to the square root of a prime number to determine if it is prime?
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edited May 26 at 19:28
answered Apr 27 '11 at 22:04
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Difference between a Seq and a List in Scala
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answered Jun 2 '12 at 23:48
Daniel C. SobralDaniel C. Sobral
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Creating an empty Pandas DataFrame, then filling it?
..., index=index, columns=columns)
In [11]: df
Out[11]:
A B C
2012-11-29 0 0 0
2012-11-30 1 1 1
2012-12-01 2 2 2
2012-12-02 3 3 3
2012-12-03 4 4 4
2012-12-04 5 5 5
2012-12-05 6 6 6
2012-12-06 7 7 7
2012-12-07 8 8 8
2012-12-08 9 9 9
...
Can you change what a symlink points to after it is created?
...ed by it:
$ ln -s .bashrc test
$ ls -al test
lrwxrwxrwx 1 pascal pascal 7 2009-09-23 17:12 test -> .bashrc
$ ln -s .profile test
ln: creating symbolic link `test': File exists
$ ln -s -f .profile test
$ ls -al test
lrwxrwxrwx 1 pascal pascal 8 2009-09-23 17:12 test -> .profile
EDIT: As the ...
How to print a float with 2 decimal places in Java?
...
263
You can use the printf method, like so:
System.out.printf("%.2f", val);
In short, the %.2f ...
Is it better to call ToList() or ToArray() in LINQ queries?
...er modified after being created and has a high chance of landing in the Gen2 heap then you may be better off taking the extra allocation of ToArray up front.
In general though I find this to be the rarer case. It's much more common to see a lot of ToArray calls which are immediately passed to ot...
What is the best way to get all the divisors of a number?
...ewgill
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2
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Changing the selected option of an HTML Select element
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329
Vanilla JavaScript
Using plain old JavaScript:
var val = "Fish";
var sel = document.getE...