markogresak

void drawLine(x1, y1, x2, y2) {
    ctx.beginPath();
    ctx.moveTo(x1, y1);
    ctx.lineTo(x2, y2);
    ctx.stroke();
  }

  double tanDeg(num x) {
    return tan(x * PI/180);
  }

markogresak

function info {
  if [[ -n "$1" ]]; then
    OIFS=$IFS
    IFS=':' read -a user <<< "$(getent passwd $1)"
    if [[ "${user[0]}" != "$1" ]]; then
      echo "$1: err"
    else
      printVals=()
      if ((${user[2]} == ${user[3]})); then
        printVals+=("enaka")

markogresak

#include <sys/file.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#define E_O_I  "odpiranju vhodne"
#define E_L_I  "zaklepanju vhodne"
#define E_UL_I "odklepanju vhodne"

markogresak

Deskriptorji

Shranimo jih lahko kot int

• STDIN_FILENO: stdin
• STDOUT_FILENO: stdout

Ali po imenu datoteke:

int deskriptor = open("pot/ime", {dovoljenje}) // vrne deskriptor

markogresak

Let's start with

== comparison table

Just wonderful transitiveness of equals operator

"" == 0 is true, 0 == "0" is true, but "" == "0" is false (by Felix Gessert on Quora)

Advanced math

markogresak

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

markogresak

OS izziv 7

Izpis procesov

ps -Ao pid,comm,%mem,user,%cpu --sort=-pcpu --no-headers

• -A: vsi procesi (po defaultu so samo od trenutnega uporabnika)
• -o: filtriranje outputa, flagi so v besedilu naloge (lahko je spremenljivka)
• --sort=-pcpu: sortiranje po porabi cpu

markogresak

#!/bin/bash

function help {
  echo -en "\033cPritisnite:
  q - izhod iz programa (quit)
  h - izpiše pomoč in čaka na pritisk tipke (help)
  c - menjava vidnosti izpisa ukaza (command toggle display)
  m - menjava vidnosti izpisa porabe pomnilnika (memory toggle display)
  p - menjava vidnosti izpisa zasedenosti cpu (cpu toggle display)
  u - menjava izpisa uporabnika (user toggle display)

markogresak

Agile is dead. Long live agility!

Here is how to do something in an agile fashion:

What to do:

• Find out where you are
• Take a small step towards your goal
• Adjust your understanding based on what you learned
• Repeat

markogresak

#!/bin/bash

# Napišite skripto streznik.sh, ki bo komunicirala s svetom preko
# imenovane cevi streznik.cev. Na to cev lahko drugi procesi pošiljajo
# ukaze strežniku:
#  - connect ime_cevi (povezovanje, podano je ime cevi, kamor naj strežnik pošilja odgovore)
#  - add N1 N2 N3 N4 ... (seštej podana števila)
#  - mult N1 N2 N3 N4 ... (zmnoži podana števila)
#  - disconnect (odklopi se od strežnika)