Stephen George sfgeorge

Using strace and lsof to debug blocked processes

You can use strace on a specific pid to figure out what a specific process is doing, e.g.:

strace -fp <pid>

You might see something like:

select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Instructions

CloudFlare is an awesome reverse cache proxy and CDN that provides DNS, free HTTPS (TLS) support, best-in-class performance settings (gzip, SDCH, HTTP/2, sane Cache-Control and E-Tag headers, etc.), minification, etc.

Make sure you have registered a domain name.
Sign up for CloudFlare and create an account for your domain.
In your domain registrar's admin panel, point the nameservers to CloudFlare's (refer to this awesome list of links for instructions for various registrars).
From the CloudFlare settings for that domain, enable HTTPS/SSL and set up a Page Rule to force HTTPS redirects. (If you want to get fancy, you can also enable automatic minification for text-based assets [HTML/CSS/JS/SVG/etc.], which is a pretty cool feature if you don't want already have a build step for minification.)
If you

	stashgrep() {
	for i in `git stash list \| awk -F ':' '{print $1}'`; do
	git stash show -p $i \| grep -H --label="$i" "$1"
	done
	}

	#!/bin/bash

	# small tool to retreive vk.com (vkontakte) users hidden metadata (state, access, dates, counts, etc) anonymously (without login)

	# sudo apt install curl

	parse(){
	local IFS=\>
	read -d \< CELL VALUE
	}

	# Gawk version
	# Remote
	grep -v "rem_address" /proc/net/tcp \| awk '{x=strtonum("0x"substr($3,index($3,":")-2,2)); for (i=5; i>0; i-=2) x = x"."strtonum("0x"substr($3,i,2))}{print x":"strtonum("0x"substr($3,index($3,":")+1,4))}'

	# Local
	grep -v "rem_address" /proc/net/tcp \| awk '{x=strtonum("0x"substr($2,index($2,":")-2,2)); for (i=5; i>0; i-=2) x = x"."strtonum("0x"substr($2,i,2))}{print x":"strtonum("0x"substr($2,index($2,":")+1,4))}'

	# No Gawk
	# Local
	grep -v "rem_address" /proc/net/tcp \| awk 'function hextodec(str,ret,n,i,k,c){