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Sorting multiple keys with Unix sort
....14,1.15n
Would use character positions 4-5 in the first field (it's all one field for fixed width) and sort numerically as the first key.
The second key would be characters 14-15 in the first field also.
(edit)
Example (all I have is DOS/cygwin handy):
dir | \cygwin\bin\sort.exe -k 1.4,1.5n -...
Javascript when to use prototypes
...at prototype so as to gain all those methods at very little runtime cost.
One vitally important part of how jQuery gets it right is that this is hidden from the programmer. It's treated purely an optimisation, not as something that you have to worry about when using the library.
The problem with J...
What characters are forbidden in Windows and Linux directory names?
...r-case and lower-case characters, so you cannot create a folder named A if one named a already exists. Worse, seemingly-allowed names like PRN and CON, and many others, are reserved and not allowed. Windows also has several length restrictions; a filename valid in one folder may become invalid if mo...
Can I invoke an instance method on a Ruby module without including it?
... As an aside, module_function turns the method into a private one, which would break other code - otherwise this'd be the accepted answer
– Orion Edwards
Nov 27 '08 at 0:17
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Using a piano keyboard as a computer keyboard [closed]
...
I haven't done any MIDI programming in years, but your fundamental idea is very sound (no pun).
MIDI is a stream of "events" (or "messages"), two of the most fundamental being "note on" and "note off" which carry with them the note num...
What happens to global and static variables in a shared library when it is dynamically linked?
...nless you use some inter-process communication library or extensions).
The One Definition Rule (ODR) still applies, meaning that you can only have one definition of the global variable visible at link-time (static or dynamic linking).
So, the key issue here is really visibility.
In all cases, sta...
Difference between \n and \r?
...ts the leftmost stop (a slow operation), \n commands the roller to roll up one line (a much faster operation) -- that's the reason you always have \r before \n, so that the roller can move while the carriage is still going leftwards!-) Wikipedia has a more detailed explanation.
for character-mode te...
Can you 'exit' a loop in PHP?
...
You are looking for the break statement.
$arr = array('one', 'two', 'three', 'four', 'stop', 'five');
while (list(, $val) = each($arr)) {
if ($val == 'stop') {
break; /* You could also write 'break 1;' here. */
}
echo "$val<br />\n";
}
...
Is cout synchronized/thread-safe?
...teed to be thread-safe, what do you think will happen in this code?
// in one thread
cout << "The operation took " << result << " seconds.";
// in another thread
cout << "Hello world! Hello " << name << "!";
You probably want each line here to act in mutual ex...
How do SQL EXISTS statements work?
...XISTS, because there will be duplicate parent records if there's more than one child record associated to the parent.
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