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#launch jstatd daemon
jstatd -J-Djava.security.policy=jstatd.all.policy

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from numpy import matrix

F = matrix('0 1; 1 1')
"""
F =  [[ Fn-1  Fn  ]  = [[0 1]
        Fn    Fn+1]]   [1, 1]]

"""

result = F**5

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app.config field                                      riak.conf variable
-------------------------------------------------------------------------------------------
yokozuna.enabled                                      yokozuna
yokozuna.solr_port                                    yokozuna.solr_port
yokozuna.solr_jmx_port                                yokozuna.solr_jmx_port
yokozuna.solr_jvm_args                                yokozuna.solr_jvm_args
yokozuna.yz_dir                                       yokozuna.data_dir
riak_repl.data_root                                   mdc.data_root
riak_core.cluster_mgr                                 mdc.cluster_manager
riak_repl.max_fssource_cluster                        mdc.max_fssource_cluster

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####Install git with git mainteners ppa

sudo add-apt-repository ppa:git-core/ppa
sudo apt-get update
sudo apt-get install git

Enabling colors in git command-line interface

git config color.ui true    

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#run a test.ping on all minions:
salt '*' test.ping

# run a command on all minions:
salt '*' cmd.run "service salt-minion restart"

# run a command on a nodegroup calls  warm_stdby:
salt -N warm_stdby  cmd.run "hostname"

#list les id with x86_64 cpu 

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f(F),F=fun(N)->S=self(),G=fun(_,0,_,L)->L;(G1,N1,Ref,L)->receive {Ref, Ret}-> G1(G1,N1-1,Ref,[Ret|L]) end end,
  Ref=erlang:make_ref(),L=[random:uniform(1000)||_<-lists:seq(1,N)],
  FW=fun()->S ! {Ref,lists:foldl(fun(J,A)->lists:sort(L) end,1,L)} end,
  {T,_V}=timer:tc(fun()->[spawn( FW )||_I <-L],G(G,length(L),Ref,[]) end),T/1000 end.

 F(100).

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# import useful modules
import matplotlib
from numpy import *
from pylab import *

# use LaTeX, choose nice some looking fonts and tweak some settings
matplotlib.rc('font', family='serif')
matplotlib.rc('font', size=16)
matplotlib.rc('legend', fontsize=16)
matplotlib.rc('legend', numpoints=1)

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#To create a classic TCP listening daemon, similar to netcat -l, use a variation of the following command.
socat TCP-LISTEN:8080 stdout

#use remotly a command shell
socat TCP4-LISTEN:1234,reuseaddr,fork 'SYSTEM:/bin/cat /home/infos.txt'

#sslify a server
socat OPENSSL-LISTEN:443,reuse‐addr,pf=ip4,fork,cert=server.pem,cafile=client.crt TCP4-CONNECT:localhost:80

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#from http://en.wikipedia.org/wiki/Function_composition_(computer_science)
def compose(*funcs):
    """Compose a group of functions (f(g(h(..)))) into a single composite func"""
    return reduce(lambda f, g: lambda *args, **kwargs: f(g(*args, **kwargs)), funcs)
 
# Example
f = lambda x: x+1
g = lambda x: x*2
h = lambda x: x-3
 

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#generate a time series
SELECT to_(DATE '2008-01-01' + (interval '12 second' * generate_series(0,57)), 'YYYY-MM-DD') AS ym