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You ve already seen grep as a way of searching files for a given string, but it can also be used to filter information This technique is often used to find out if a given process is running or to check if a certain network port is offered by your server For example, the command sudo ps aux | grep http will show you all lines in the output of the command ps aux (which produces a list of all processes active at your server) that contain the text http Another example is sudo netstat -tulpen | grep 22 in which the output of netstat -tulpen (which produces a list of all processes that are offering network connections on your server) is examined for the occurrence of the number 22 (the SSH port) You can see what this looks like in Listing 2-9 Listing 2-9.

We ve made a lot of changes to our models, so let s make sure we re on the same page before we move on. First, take a look at the Event model in Listing 5-27 and make sure that yours matches.

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SalesOrderDetail GROUP BY SalesOrderID HAVING SUM(LineTotal) > @totsales/@numofsales The next result set listing shows the output from each of the preceding three code segments There are three sets or rows in the result set one corresponding to each code segment The first code segment is the SELECT statement that gives the number of items ordered and the prices paid for those orders There is no filtering for these orders The SalesOrderID column values proceed sequentially in an uninterrupted path from 43659 to 43663 The second set of rows is just a single row The third column in this row reflects the average revenue per order (40469467697441601) based on the total revenue across all orders (12733718011) and the total number of orders (31465) The third result set includes five rows just like the first result set.

However, the price of items ordered for each order in the third result set is greater than the average revenue per order Two sales orders (43660 and 43663) from the first result set with a price of items ordered below the average revenue are removed from the third result set and replaced by the next two other orders (43664 and 43665) with revenue greater than the average revenue for all orders..

Filtering Command Output by Piping to grep sander@RNA:~$ sudo netstat -tulpen | grep 22 tcp6 0 0 :::22 :::* LISTEN 0 15332 4321/sshd.

class Event < ActiveRecord::Base belongs_to :user has_many :registrations has_many :attendees, :through => :registrations, :source => :user has_and_belongs_to_many :categories validates_presence_of :title, :location after_create :ensure_owner_attends validate :has_not_occurred def is_in_the_past occurs_on < Date.today end

SalesOrderID -----------43659 43660 43661 43662 43663

def long_title "#{title} - #{location} - #{occurs_on}" end protected def ensure_owner_attends unless attendees.include user attendees << user end end def has_not_occurred errors.add("occurs_on", "is in the past") if occurs_on && is_in_the_past end end

Whereas piping sends the result of a command to another command, redirection sends the result of a command to a file or the contents of a file to a command. As I mentioned, this file can be a text file, but it can also be a special file like a device file. An easy example

Items ordered ------------12 2 15 22 1

Our Event model is nicely filled out, but we still need to do a little bit of work on our User model. We ll be applying a lot of the techniques we described in this chapter, such as custom methods to allow us to perform user authentication, and validation methods to make sure our data stays clean. When we created the user migration (Listing 5-2), we added a field called password. This field stored a plain-text password, which if you think about it, isn t very secure. It s always a good idea to encrypt any sensitive data so it can t be easily read by would-be intruders. We ll deal with the encryption in the User model itself, but the first thing we ll do is rename the field in the database from password to hashed_password. This is so we can create a custom accessor called password with which we can set the password while maintaining a field to store the encrypted version in the database. The plain-text password will never be saved. To accomplish this, we ll create a migration. From the terminal, issue the following command to create the new migration:

Price of items ordered ---------------------20565.62 1294.25 32726.48 28832.53 419.46

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