seansawyer

DROP FUNCTION IF EXISTS hex_to_bit_varying(hex_string text);
CREATE FUNCTION hex_to_bit_varying(hex_string text) RETURNS bit varying AS $$
DECLARE
  bytes bytea = decode(hex_string, 'hex');
  n int = length(bytes) * 8 - 1;
  bits bit varying := B''::bit varying;
BEGIN
  -- RAISE NOTICE 'bytes=%, n=%', bytes, n;
  -- RAISE NOTICE 'bits=%', bits;
  FOR i IN 0 .. n BY 8 LOOP

seansawyer

Print all libs loadable at runtime

ldconfig -p
# 208 libs found in cache `/etc/ld.so.cache'
#     libz.so.1 (libc6,x86-64) => /lib64/libz.so.1
#     libz.so (libc6,x86-64) => /usr/lib64/libz.so
# ...

Print all libs loadable at compile time

seansawyer

$ time shuf -i 1-4294967296 -n 10000000 | sort | uniq - sorted1.txt                                                      

real    0m21.387s
user    0m22.700s
sys     0m0.820s
$ time shuf -i 1-4294967296 -n 10000000 | sort | uniq - sorted2.txt                                                      

real    0m21.230s
user    0m22.417s
sys     0m0.703s

seansawyer

# Meta Man
man man

# When your last commit has some garbage author info - maybe you committed in a VM or something
git commit --amend --reset-author

# Sudo do the last thing I said
sudo !!

# Remove an item from your history - maybe you typed your password by accident

seansawyer

# Prefix
set -g prefix C-j

# Copy mode
unbind [
bind Escape copy-mode
# Use Vi mode
setw -g mode-keys vi
# Make mouse useful in copy mode
setw -g mode-mouse on

seansawyer

awk "/\\{vsn, \"([0-9]+)\"\\}/" src/synchole.app.src | sed -En "s/[^[:digit:]]*([[:digit:]]+)[^[:digit:]]*/\1/p"

seansawyer

git clone git@github.com:vitrue/synchole.git
cd synchole
rebar clean compile generate
%% extract version number from reltool.config
mv rel/synchole rel/synchole_VSN
scp rel/synchole_VSN deploy@dest:/data/synchole/rel

seansawyer

Thrift with C/glib

• Thrift C tests - https://git1-us-west.apache.org/repos/asf?p=thrift.git;a=tree;f=test/c_glib/src;hb=HEAD
• StackOverflow question on how to create a server - http://stackoverflow.com/questions/29506326/how-do-i-create-a-thrift-server-in-c-with-glib
• Blog post on using Thrift with Cassandra from C - http://tlfabian.blogspot.com/2012/01/thrift-cglib-and-cassandra.html
• Thrift JIRA thread on the issue - https://issues.apache.org/jira/browse/THRIFT-976

Kafka

• C client library - https://github.com/edenhill/librdkafka

seansawyer

Install Virtualbox, Vagrant and Ansible.

Create a new directory for your first Vagrant VM. In that directory, create a Vagrantfile using vagrant init, and enable the Ansible provisioner by adding the following.

config.vm.provision "ansible" do |ansible|
  ansible.playbook = "playbook.yml"
end

Now you can create an Ansible playbook named playbook.yml file in the same directory as your Vagrantfile, and vagrant provision will run it. Here's an easy one to start with that will update NSS and add the EPEL and IUS repositories.

seansawyer

<?php

/**
 * Try to acquire an arbitrarily-named lock by binding a Unix
 * (family AF_UNIX) datagram (type SOCK_DGRAM) socket to an
 * abstract address corresponding to the lock name. On success,
 * the bound socket resource is returned (or null, on
 * failure). You may either call unlock() with that resource to
 * release the lock explicitly, or rely on the operating system
 * to clean up the socket when the process exits.