| #!/bin/bash | |
| NAGIOS='/usr/sbin/nagios3' | |
| NAGIOS_CONFIG='/etc/nagios3/nagios.cfg' | |
| $NAGIOS -v $NAGIOS_CONFIG > /dev/null | |
| result=$? | |
| if [ $result -eq 0 ] |
The following is an explanation of Ruby blocks and yield by another Bloc mentor who was trying to explain it to one of his students.
On my very first day programming, if someone asked me for "the sum of the numbers from 1 to 10", I'd have written:
puts 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
Easy enough.
| Debian's apt system truely revolutionized linux package management. It inspired other distros to port apt, or build similar functionality such as the urpmi system. For many people, it is the main reason they run Debain. | |
| Below is a quick reference to cover some of the most commonly needed apt uses. | |
| Download and install package: | |
| apt-get install package | |
| Update apt's list of available packages: | |
| apt-get update |
| Debian's apt system truely revolutionized linux package management. It inspired other distros to port apt, or build similar functionality such as the urpmi system. For many people, it is the main reason they run Debain. | |
| Below is a quick reference to cover some of the most commonly needed apt uses. | |
| Download and install package: | |
| apt-get install package | |
| Update apt's list of available packages: | |
| apt-get update |
| [2] pry(main)> class SomeClass | |
| [2] pry(main)* include Greeter | |
| [2] pry(main)* end | |
| => SomeClass | |
| [3] pry(main)> SomeClass.new.hello | |
| => "hi" | |
| [4] pry(main)> class AnotherClass | |
| [4] pry(main)* extend Greeter | |
| [4] pry(main)* end | |
| => AnotherClass |
| I know how to execute remote bash script, via these syntaxes: | |
| curl http://foo.com/script.sh | bash | |
| or | |
| bash < <( curl http://foo.com/script.sh ) | |
| which give the same result. | |
| But what if I need to pass arguments to the bash script ? It's possible when the script is saved locally: |
| #!/usr/bin/env ruby | |
| require 'pp' | |
| def show_regexp(a,re) | |
| if a =~ re | |
| "#{$`} << #{$&} >> #{$'}" | |
| else | |
| "no match" | |
| end | |
| end |
| #!/usr/bin/env ruby | |
| require 'pp' | |
| class TaxCalculator | |
| def initialize(name, &block) | |
| @name, @block = name, block | |
| end | |
| def get_tax(amount) | |
| "#@name on #{amount} = #{ @block.call(amount)}" |
| print "(t)imes or (p)lus: " | |
| times = gets | |
| print "number: " | |
| number = Integer(gets) | |
| if times =~ /^t/ | |
| calc = lambda {|n| n*number} | |
| else | |
| calc = lambda { |n| n+number } | |
| end | |
| puts ((1..10).collect(&calc).join(",")) |
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