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Tho Vo th0j

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@th0j
th0j / Install_Emacs.md
Last active November 30, 2019 00:12
Install emacs 26.1 on Ubuntu 18.03

Emacs dependencies

sudo apt-get install build-essential texinfo libx11-dev libxpm-dev libjpeg-dev libpng-dev libgif-dev libtiff-dev libgtk2.0-dev libncurses-dev libxpm-dev automake autoconf

Build emacs

mkdir emacs
cd emacs
@th0j
th0j / benchmark.rb
Created August 21, 2018 04:48
Benchmark ruby
sizes = [10, 50, 100, 1000]
sizes.each do |size|
array = size.times.map { |i| rand(size) }
threshold = size / 2
Benchmark.bmbm(2) do |x|
x.report("select #{size}") do
array.select { |item| item > threshold }
.each { |item| item * item }
@th0j
th0j / .drink_water_linux.sh
Last active October 28, 2018 10:30
Send notification to remember drink water
eval "export $(egrep -z DBUS_SESSION_BUS_ADDRESS /proc/$(pgrep -u $LOGNAME gnome-session)/environ)";
DISPLAY=:0 notify-send "Hey!!!" "Keep your back straight and remember drink water!"
@th0j
th0j / sodoku.c
Last active October 4, 2018 15:41
#include <stdio.h>
#include <stdlib.h>
int main() {
int n = 3;
int m = 3;
int a[3][3] = { 0 };
a[1][1] = 5;
int x = 5;
@th0j
th0j / measure.rb
Created September 16, 2018 15:41
measure Ruby performance
def measure(no_gc = true, &block)
if no_gc
GC.disable
else
GC.start
end
memory_before = `ps -o rss= -p #{Process.pid}`.to_i/1024
gc_stat_before = GC.stat
time = Benchmark.realtime do
yield
@th0j
th0j / import_large_sql.sh
Created September 14, 2018 01:19
Import a large sql dump file to a MySQL database from command line
#!/bin/sh
# store start date to a variable
imeron=`date`
echo "Import started: OK"
dumpfile="/home/bob/bobiras.sql"
ddl="set names utf8; "
ddl="$ddl set global net_buffer_length=1000000;"
@th0j
th0j / Guide.md
Created August 21, 2018 07:47
Apache2 Passenger Rails
@th0j
th0j / mysql_note.md
Created July 30, 2018 04:38
mysql note

Change password

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '';
@th0j
th0j / split_sql.rb
Created July 30, 2018 03:59
Split big sql file
filename = 'flowdata_201803052230.sql'
INSERT_MATCHER = 'INSERT INTO'
file = 1
counter = 1
File.open(filename, 'r').each do |line|
next unless line.include? INSERT_MATCHER
File.open(file.to_s + '.sql', 'a+') { |file| file.write("\n" + line) }
@th0j
th0j / access_control.rb
Created July 23, 2018 03:23
Access control in ruby
class A
protected
def protected_a
puts "Protected A"
end
private
def private_a
puts "Private A"
end