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What generates the “text file busy” message in Unix?
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@FelipeValdes The name is historical from the terminology of a half century ago. For example, in multics the text segment of a program was distinct from the link segment, and even earlier people talked about binary text. stackoverflow.com/a/1282540/833300
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What is the boundary in multipart/form-data?
...S-ASCII charset will be used in the payload data.
A few relevant excerpts from the RFC2046:
4.1.2. Charset Parameter:
Unlike some other parameter values, the values of the charset parameter are NOT case sensitive. The default character set, which must be assumed in the absence of a charset p...
How to sum array of numbers in Ruby?
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How can I use this way to sum a attribute from object. My array [product1, product2] I want to sum product1.price + product2.price. Is it possible using array.inject(:+)?
– Pablo Cantero
Apr 27 '11 at 20:45
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C++ unordered_map using a custom class type as the key
...p; third == other.third);
}
};
Here is a simple hash function (adapted from the one used in the cppreference example for user-defined hash functions):
namespace std {
template <>
struct hash<Key>
{
std::size_t operator()(const Key& k) const
{
using std::size...
Why is processing a sorted array faster than processing an unsorted array?
...less.
Further reading: "Branch predictor" article on Wikipedia.
As hinted from above, the culprit is this if-statement:
if (data[c] >= 128)
sum += data[c];
Notice that the data is evenly distributed between 0 and 255. When the data is sorted, roughly the first half of the iterations will no...
Trouble comparing time with RSpec
...ins greater precision than the database does. When the value is read back from the database, it’s only preserved to microsecond precision, while the in-memory representation is precise to nanoseconds.
If you don't care about millisecond difference, you could do a to_s/to_i on both sides of your ...
Defining and using a variable in batch file
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set "location=bob"
The last syntax prevents inadvertent trailing spaces from getting in the value, and also protects against special characters like & | etc.
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Getting the first and last day of a month, using a given DateTime object
...t day and last day of the month where a given date lies in. The date comes from a value in a UI field.
15 Answers
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How can I list (ls) the 5 last modified files in a directory?
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By default ls -t sorts output from newest to oldest, so the combination of commands to use depends in which direction you want your output to be ordered.
For the newest 5 files ordered from newest to oldest, use head to take the first 5 lines of output:
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How to switch activity without animation in Android?
...ks just great especially for transparent/dialog themed activities excluded from recents with a different task affinity. Without this the animation kept showing creating very odd results for a dialog being opened!
– 3c71
Oct 5 '13 at 8:54
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