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Fast Linux File Count for a large number of files
...lot of them. Also there will be no output until all of the names are read and sorted. Use the ls -f option to turn off sorting.
ls -f | wc -l
Note that this will also enable -a, so ., .., and other files starting with . will be counted.
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Unicode (UTF-8) reading and writing to files in Python
I'm having some brain failure in understanding reading and writing text to a file (Python 2.4).
14 Answers
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Using Emacs to recursively find and replace in text files not already open
...ld be easy, that especially stops me from getting more used to using Emacs and instead starting up the editor I'm already familiar with. I use the example here fairly often in editing multiple files.
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How to flatten tree via LINQ?
...er style", convert Flatten to a generic extension method that takes a tree and a function that produces descendants from a node:
public static IEnumerable<T> Flatten<T>(
this IEnumerable<T> e
, Func<T,IEnumerable<T>> f
) => e.SelectMany(c => f(c).Flatten(f)...
Calculate business days
...tion in the comments that adds support for leap years.
Enter the starting and ending dates, along with an array of any holidays that might be in between, and it returns the working days as an integer:
<?php
//The function returns the no. of business days between two dates and it skips the holid...
How to run a single test from a rails test suite?
...kefile will NOT get executed.
To run a single test, use the following command from your rails project's main directory:
ruby -I test test/unit/my_model_test.rb -n test_name
This runs a single test named "name", defined in the MyModelTest class in the specified file. The test_name is formed by t...
What does the ^ operator do in Java?
...--- xor
3 = 011
This the truth table for bitwise (JLS 15.22.1) and logical (JLS 15.22.2) xor:
^ | 0 1 ^ | F T
--+----- --+-----
0 | 0 1 F | F T
1 | 1 0 T | T F
More simply, you can also think of xor as "this or that, but not both!".
See also
Wikipedia: exclusive-...
How to go about formatting 1200 to 1.2k in java
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Here is a solution that works for any long value and that I find quite readable (the core logic is done in the bottom three lines of the format method).
It leverages TreeMap to find the appropriate suffix. It is surprisingly more efficient than a previous solution I wrote t...
How to extract one column of a csv file
...ou are a lucky guy using GNU Tools in Windows, you can execute the same comand as @IgorMikushkin as follows: gawk -F"|" "{print $13}" files*.csv
– Elidio Marquina
May 25 '17 at 18:33
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Detect if stdin is a terminal or pipe?
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On POSIX there is no io.h and for isatty() you need to include unistd.h.
– maxschlepzig
Sep 29 '11 at 13:22
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