dergachev

# Copied from http://ttaportal.org/wp-content/uploads/2012/10/7-Reallocation-using-LVM.pdf

##
## Showing the problem: need to reallocate 32GB from /dev/mapper/pve-data to /dev/mapper/pve-root
##

df -h
#    Filesystem Size Used Avail Use% Mounted on
#    /dev/mapper/pve-root 37G 37G 0 100% /
#    tmpfs 2.0G 0 2.0G 0% /lib/init/rw

dergachev

# taken from http://www.piware.de/2011/01/creating-an-https-server-in-python/
# generate server.xml with the following command:
#    openssl req -new -x509 -keyout server.pem -out server.pem -days 365 -nodes
# run as follows:
#    python simple-https-server.py
# then in your browser, visit:
#    https://localhost:4443

import BaseHTTPServer, SimpleHTTPServer
import ssl

dergachev

#!/bin/bash

# Script to convert PDF file to JPG images
#
# Dependencies:
# * pdftk
# * imagemagick

PDF=$1

dergachev

Why You Can't Un-Root a Compromised Machine

Let's say somebody temporarily got root access to your system, whether because you "temporarily" gave them sudo rights, they guessed your password, or any other way. Even if you can disable their original method of accessing root, there's an infinite number of dirty tricks they can use to easily get it back in the future.

While the obvious tricks are easy to spot, like adding an entry to /root/.ssh/authorized_keys, or creating a new user, potentially via running malware, or via a cron job. I recently came across a rather subtle one that doesn't require changing any code, but instead exploits a standard feature of Linux user permissions system called setuid to subtly allow them to execute a root shell from any user account from the system (including www-data, which you might not even know if compromised).

If the "setuid bit" (or flag, or permission mode) is set for executable, the operating system will run not as the cur

dergachev

Exposing your clipboard over SSH

I frequently administer remote servers over SSH, and need to copy data to my clipboard. If the text I want to copy all fits on one screen, then I simply select it with my mouse and press CMD-C, which asks relies on m y terminal emulator (xterm2) to throw it to the clipboard.

This isn't practical for larger texts, like when I want to copy the whole contents of a file.

If I had been editing large-file.txt locally, I could easily copy its contents by using the pbcopy command:

soheilhy

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

revolunet

libcaca output from your OSX webcam

ffmpeg -f avfoundation -framerate 30 -s "640x480" -i "0" -c:v rawvideo -pix_fmt rgb24 -f caca -s "640x480" output4.mp4

brew install ffmpeg with options

brew install homebrew-ffmpeg/ffmpeg/ffmpeg --with-libcaca

convert to another format, resize withouth quality loss

ffmpeg -i vitrine.mp4 -vf scale=1024:-1 -q:vscale 0 vitrine.avi

yang-wei

execute pathogen#infect()
syntax on
filetype plugin indent on

set nocompatible               " Be iMproved
set tabstop=2   
set expandtab
set softtabstop=2
set shiftwidth=2
set smarttab

mbaldessari

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <net/if.h>
#include <ctype.h>

#define ETHTOOL_GSET    0x1
#define SIOCETHTOOL     0x8946

dwgill

#!/usr/bin/env bash
# This script requires:
# - that the directory $HOME/.mpv exist 
# - that the program socat be installed
# - that you start mpv with the unix socket feature pointing at that directory
#   I recommend an alias in your .bashrc or equivalent file:
#       alias mpv="mpv --input-unix-socket=$HOME/.mpv/socket"

socket="$HOME/.mpv/socket"