JosephPecoraro

# Ways to execute a shell script in Ruby
# Example Script - Joseph Pecoraro

cmd = "echo 'hi'" # Sample string that can be used

# 1. Kernel#` - commonly called backticks - `cmd` 
# This is like many other languages, including bash, PHP, and Perl
#   Synchronous (blocking)
#   Returns the output of the shell command
#   Docs: http://ruby-doc.org/core/classes/Kernel.html#M001111

endolith

function [maxtab, mintab]=peakdet(v, delta, x)
%PEAKDET Detect peaks in a vector
%        [MAXTAB, MINTAB] = PEAKDET(V, DELTA) finds the local
%        maxima and minima ("peaks") in the vector V.
%        MAXTAB and MINTAB consists of two columns. Column 1
%        contains indices in V, and column 2 the found values.
%      
%        With [MAXTAB, MINTAB] = PEAKDET(V, DELTA, X) the indices
%        in MAXTAB and MINTAB are replaced with the corresponding
%        X-values.

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

kgrz

# This is a modification of the blogpost on how to use Mongoid and Sinatra.
# Here is the original blogpost http://www.garrensmith.com/2010/09/11/Mongoid-sinatra.html
# The modification lets you use Mongoid 3.0 with the new Moped driver

# The new Moped driver uses the Sessions component to define the MongoDB connection rather
# than the Mongo::Connection.new that is used in the case of the default Ruby driver.
# Moped::Session.new vs Mongo::Connection.new

# Mongoid.load!(yaml_config.yml) is used to build the config hash. Alternatively, the hash can
# be built manually by using Mongoid.config {|config| ...} syntax. The config.sessions hash 

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

beezly

function zeroCells() {
  var ss=SpreadsheetApp.getActiveSpreadsheet();
  var sheet=ss.getSheets()[0];
  var selection=sheet.getDataRange();
  var columns=selection.getNumColumns();
  var rows=selection.getNumRows();
  for (var column=1; column < columns; column++) {
    for (var row=1; row < rows; row++) { 
      var cell=selection.getCell(row,column);
      if (cell.isBlank()) {

soimort

　　 ∧,_,∧
　　(`･ω･´)　 ｎ__
`__ｎ 〉　 ⌒＼/ ､_∃
Ｅ_,У ∧　　＼_/
　 ＼_/　＼　　丶
　　　　 ／ y　 ﾉ
　　　 ／ ／　／
　　　(　(　〈
　　　 ＼ ＼　＼
　　　　(＿(＿＿)

soimort

Δ~~Δ
ξ •ｪ• ξ
ξ　~ ξ
ξ　　ξ
ξ　　⌒～~～~〇
ξ　　　, 　　　 ξ
ξ　ξξ　ξ~~~ξ　ξ
ξ_ξ ξ_ξ　 　ξ_ξ

gbaptista

# RVM sudo.
rvmsudo passenger-install-nginx-module
rvmsudo ruby test.rb

# Root console.
sudo clear; sudo gnome-terminal 2>/dev/null &

# Find service:
ps aux | grep 'nginx'

soimort

┏┳━━━━━━┳┓ 
┃┃・ ▼ ・┃┃ 
┃┃〃┗┻┛〃┃┃ 
┗┫┏┓ ┏┓ ┣┛ 
┗┫ ┣━┫┣━┛