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Delete all but the most recent X files in bash
... handle NUL-separated input, after first translating newlines to NUL (0x0) chars., which also passes (typically) all filenames at once (will also work with GNU xargs):
ls -tp | grep -v '/$' | tail -n +6 | tr '\n' '\0' | xargs -0 rm --
Explanation:
ls -tp prints the names of filesystem items sor...
HTML for the Pause symbol in audio and video control
...y default) in order to instruct the parser how to transform the bytes into characters correctly. <meta charset="utf-8"/> should be used immediately after <head> in a HTML file, and make sure the correct HTTP headers Content-Type: text/html; charset=utf-8 are set.
Examples:
HTML
&...
Bold words in a string of strings.xml in Android
I have a long text in one of the strings at strings.xml. I want to make bold and change the color of some words in that text.
...
How to generate a random int in C?
...
If you need secure random characters or integers:
As addressed in how to safely generate random numbers in various programming languages, you'll want to do one of the following:
Use libsodium's randombytes API
Re-implement what you need from libsod...
Guava: Why is there no Lists.filter() function?
...mmutableCollection, I find this a good design trade-off (vs coming up with extra methods & names, like filteredCopy or whatnot, for combinations of simple utilities).
– Luke Usherwood
Jul 31 '18 at 16:10
...
What does “not run” mean in R help pages?
...run{} for text that should only be shown, but not run, and \dontshow{} for extra commands for testing that should not be shown to users, but will be run by example()
When you build a package then all code in \dontrun{} closure is visible in help as
## Not run:
...
## End(**Not run**)
edit: Thi...
How can I plot with 2 different y-axes?
...otrix package automates this process, as does doubleYScale() in the latticeExtra package.
Another example (adapted from an R mailing list post by Robert W. Baer):
## set up some fake test data
time <- seq(0,72,12)
betagal.abs <- c(0.05,0.18,0.25,0.31,0.32,0.34,0.35)
cell.density <- c(0,10...
How to generate a random number in C++?
...in a random generator in this way:
#include <iostream>
#include <string>
// Used in randomization
#include <ctime>
#include <boost/random/mersenne_twister.hpp>
#include <boost/random/uniform_int_distribution.hpp>
#include <boost/random/variate_generator.hpp>
us...
Converting a Java Keystore into PEM Format
...
KeyStore ks = KeyStore.getInstance("jks");
/* Load the key store. */
...
char[] password = ...;
/* Save the private key. */
FileOutputStream kos = new FileOutputStream("tmpkey.der");
Key pvt = ks.getKey("your_alias", password);
kos.write(pvt.getEncoded());
kos.flush();
kos.close();
/* Save the cer...
How to send commands when opening a tmux session inside another tmux session?
...It works for me with 1.7, 1.6, and 1.5. You will definitely need to add an extra level of quoting if you are making the binding from a shell command (i.e. tmux bind-key -n 'C-\' send-prefix); if you are having problems getting it to work from ~/.tmux.conf (or a Prefix : command line), then you might...