Аббас Гусенов gusenov

warning: ignoring broken ref refs/remotes/origin/HEAD


➜   ✗ g symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/develop
➜   ✗ g fetch --prune
➜   ✗ g gc

Using grep (well, pcregrep) to display the labels of reference style links in a Markdown document:

$ pcregrep --only-matching=1 \  # Only display the match from group 1
  "\[.*?\](\[.*?\])" \          # Find [text][label] reference style links
  /path/to/document.md | \      # Path to the markdown document
  sort                          # Optionally sort the output

I had the regexp working in grep but couldn't capture just the group I was interested in. This Stack Overflow answer suggested pcregrep.

UFW

I use Ubuntu’s Uncomplicated firewall because it is available on Ubuntu and it's very simple.

Install UFW

if ufw is not installed by default be sure to install it first.

Every so often I have to restore my gpg keys and I'm never sure how best to do it. So, I've spent some time playing around with the various ways to export/import (backup/restore) keys.

Method 1

Backup the public and secret keyrings and trust database

cp ~/.gnupg/pubring.gpg /path/to/backups/
cp ~/.gnupg/secring.gpg /path/to/backups/
cp ~/.gnupg/trustdb.gpg /path/to/backups/

or, instead of backing up trustdb...

	import contextlib
	import OpenSSL.crypto
	import os
	import requests
	import ssl
	import tempfile

	@contextlib.contextmanager
	def pfx_to_pem(pfx_path, pfx_password):
	''' Decrypts the .pfx file to be used with requests. '''

	<!doctype html>
	<html lang=en>
	<head>
	<meta charset=utf-8>
	<title>Copy To Clipboard Example</title>
	</head>
	<body>

	<input id="txtToCopy" type="text">
	<button id="btnCopy">Copy!</button>

	Below are the Big O performance of common functions of different Java Collections.


	List \| Add \| Remove \| Get \| Contains \| Next \| Data Structure
	---------------------\|------\|--------\|------\|----------\|------\|---------------
	ArrayList \| O(1) \| O(n) \| O(1) \| O(n) \| O(1) \| Array
	LinkedList \| O(1) \| O(1) \| O(n) \| O(n) \| O(1) \| Linked List
	CopyOnWriteArrayList \| O(n) \| O(n) \| O(1) \| O(n) \| O(1) \| Array

	chmod cheat sheet

	PERMISSION COMMAND

	U G W
	_____________________________________
	\|rwx rwx rwx chmod 777 <filename> \|
	\|_____________________________________\|
	\|rwx rwx r-x chmod 775 <filename> \|
	\|_____________________________________\|

	#!/bin/bash

	LOCAL_BRANCH=$1
	REMOTE_BRANCH="${2:-origin}/$1"

	if [ x"$(git rev-parse $LOCAL_BRANCH)" != x"$(git rev-parse $REMOTE_BRANCH)" ]
	then
	echo "$LOCAL_BRANCH is not in sync with $REMOTE_BRANCH. You may want to rebase or push first."
	fi

	# create container with key authentication
	sudo lxc-create -t ubuntu -n test -- -S /root/.ssh/id_rsa.pub
	sudo lxc-start -n test -d
	sudo lxc-wait -n test -s RUNNING
	# enable passwordless sudo for ubuntu user
	chroot /var/lib/lxc/test/rootfs sh -c "echo 'ubuntu ALL=NOPASSWD:ALL' > /etc/sudoers.d/ubuntu; chmod 440 /etc/sudoers.d/ubuntu"
	# now you can run commands in container, example: install avahi-daemon
	ssh `cat /var/lib/misc/dnsmasq.leases \| grep --word-regexp test \| awk '{print $3}'` -l ubuntu -o "StrictHostKeyChecking no" sudo apt-get install -y avahi-daemon