heppu

Create bootable USB

dd bs=4M if=/path/to/archlinux.iso of=/dev/sdx status=progress oflag=sync

Boot from USB and set prepare system

loadkeys <your-keymap>

nested-cont.scm

(define (cc k) (call-with-current-continuation k))
(display (format ">>> ~s\n" (- 10 (cc (lambda (k) (+ 1 (+ 2 (k 10))))))))

(let ((k (cc (lambda (bind) (lambda (x) (+ 1 (cc (lambda (k) (bind k))))))))) (k 10))
(let ((k (cc (lambda (bind)
             	(lambda (x)
             		(+ 1 (cc (lambda (k) 
             		         	(bind k))))))))) 
	(k 10))

lkuper

#lang racket

;; A solver for the following puzzle:
;; Given 5 integers a, b, c, d, and e,
;; find an expression that combines a, b, c, and d with arithmetic operations (+, -, *, and /) to get e.

(require srfi/1)

(define ops '(+ - * /))

howardabrams

(defun remote-shell-fav-hosts-get ()
  "My hook to the remote-shell processes in order to connect to
    my OpenStack controller, and create a hashtable of host names as
    the keys, and IP addresses as the values."
  (interactive)

  ;; Run nova list command remotely on this host system, and put the
  ;; results in a temp buffer:
  (let* ((undercloud-controller "10.98.1.145")
         (default-directory    (format "/ssh:%s:" undercloud-controller))

pathikrit

/**
 * Solves the n-Queen puzzle in O(n!)
 * Let p[r] be the column of the queen on the rth row (must be exactly 1 queen per row)
 * There also must be exactly 1 queen per column and hence p must be a permuation of (0 until n)
 * There must be n distinct (col + diag) and n distinct (col - diag) for each queen (else bishop attacks)
 * @return returns a Iterator of solutions 
 *     Each solution is an array p of length n such that p[i] is the column of the queen on the ith row
 */
def nQueens(n: Int): Iterator[Seq[Int]] = 
  (0 until n)

floriandejonckheere

# This entry boots an Antergos (Arch) Linux ISO straight from disk.
# LVM is not supported because the lvm module is not loaded in Antergos initrd

menuentry "Antergos Minimal ISO 2015-09-13" {
        insmod part_gpt
        insmod lvm
        insmod loopback
        set root=(hd0,0)
        set isofile=/antergos.iso
        search --no-floppy --file ${isofile} --set

CAFxX

📂 Persistent "pipes" in Linux

In a project I'm working on I ran into the requirement of having some sort of persistent FIFO buffer or pipe in Linux, i.e. something file-like that could accept writes from a process and persist it to disk until a second process reads (and acknowledges) it. The persistence should be both across process restarts as well as OS restarts.

AFAICT unfortunately in the Linux world such a primitive does not exist (named pipes/FIFOs do not persist

mindplay-dk

This page provides a full overview of PHP's SessionHandler life-cycle - this was generated by a set of test-scripts, in order to provide an exact overview of when and what you can expect will be called in your custom SessionHandler implementation.

Each example is a separate script being run by a client with cookies enabled.

To the left, you can see the function being called in your script, and to the right, you can see the resulting calls being made to a custom session-handler registed using session_set_save_handler().

Pysis868

# Config for GNU GRand Unified Bootloader (GRUB) (2)
  # /boot/grub2/grub.cfg
  # or
  # /boot/grub/grub.cfg
  # Mostly only 'legacy' CSM/BIOS boot methods currently.
  # Unable to boot loop entries with Secure Boot

# Notes:
  # Description:
    # This grub.cfg file was created by Lance http://www.pendrivelinux.com

Hydrotoast

import numpy as np

# The Fibonacii matrix
M = np.array([[0, 1], [1, 1]], dtype=np.float32)

# Compute the eigendecomposition of the matrix
w, v = np.linalg.eig(M)
inv_v = np.linalg.inv(v)

base_case = np.array([0, 1]).T # base case as a column vector