tuxfight3r

#ifconfig | head -n2 | tr -d '\n' |sed -n 's/.*addr\s\([0-9]\{2\}:[^ ]*\).*addr:\([^ ]*\).*/mac:\1 - ip:\2\n/p'
mac:08:00:27:89:8b:8f - ip:157.203.249.51

tuxfight3r

#!/bin/bash
#Purpose:To Mirror Centos Updates x86_64 repo to local folder via 
#squid proxy and also to update it periodically
#Author:Mohan


#export the squid proxy server
export http_proxy=192.168.2.100:3128

REPO_URL='http://mirror.centos.org/centos-6/6.5/updates/x86_64/Packages/'

tuxfight3r

#!/bin/bash
# pre-commit git hook to check the validity of a puppet manifest
# 
# Prerequisites: 
#   gem install puppet-lint puppet
# 
# Install: 
#  /path/to/repo/.git/hooks/pre-comit

# Source RVM if needed

tuxfight3r

# good git book
http://git-scm.com/book

# Discard uncommitted changes in a specific file
git checkout file_name

# Clear everything not in repo
git checkout -- .

# A way to quickly move to the previous commit in a git branch. This also way for "deleting" last commit.

tuxfight3r

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

tuxfight3r

#Ping scan a subnet
seq 254 | xargs -P255 -I% sh -c "ping -q -c1 -w1 192.168.0.% > /dev/null || echo 192.168.0.% DOWN"

tuxfight3r

#ruby manipulate array values with map

irb(main):040:0> array=%w(one two three four five)
=> ["one", "two", "three", "four", "five"]

irb(main):042:0> array.map{|item| "ldap://#{item}" }.join(',')
=> "ldap://one,ldap://two,ldap://three,ldap://four,ldap://five"

tuxfight3r

#Basic lambda Hello World
irb(main):122:0> test=lambda{"Hello World"}
=> #<Proc:0x00000001393e28@(irb):122 (lambda)>
irb(main):123:0> test.call
=> "Hello World"
 
#lambda function to remove nth object from an array
irb(main):115:0> str=lambda {|arr,div| arr.each_with_index.map{|x,i| i+=1; next if i % div == 0; x}.compact }
=> #<Proc:0x00000001570a70@(irb):115 (lambda)>
irb(main):116:0> str.call((0..20).to_a, 3)

tuxfight3r

# Block Examples

[1,2,3].each { |x| puts x*2 }   # block is in between the curly braces

[1,2,3].each do |x|
  puts x*2                    # block is everything between the do and end
end

# Proc Examples             
p = Proc.new { |x| puts x*2 }

tuxfight3r

str=lambda {|arr,div| arr.each_with_index.map{|x,i| i=i+1; next if i % div == 0; x}.compact  }
=> #<Proc:0x000000015a7138@(irb):138 (lambda)>
irb(main):139:0> str.call((0..20).to_a, 3)
=> [0, 1, 3, 4, 6, 7, 9, 10, 12, 13, 15, 16, 18, 19]
irb(main):140:0> str.call((1..20).to_a, 3)
=> [1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20]