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After a password has been entered for a user, such as the www user, it should appear as an encrypted string in the shadow password database (/etc/shadow):

# grep www /etc/shadow www:C4dMH8As4bGTM:::::::

Once this large crystal of silicon has been manufactured, it must be cut into slices to manufacture the solar cells. I like to think of this a bit like the way an egg is sliced to make sandwiches by an egg slicer see the analogy in Figures 10-9 and 10-10.

Once a user has been granted an initial password, he or she may then enter a new password by using the passwd command with no options.

Now imagine that one of your prized employees has moved on to greener pastures unexpectedly although you will eventually be able to change the ownership on all of

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his or her files, you cannot immediately restart some production applications. In this case, you can temporarily disable logins to a specific account by using a command like this:

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Let s walk through the code and see how we ve implemented the data structures and decision procedures required to implement the password database administration interface. We start by declaring three functions: printMenu(), getInput()I, and enterData(FILE *fp). These will be used to print the application menu to standard output, process user menu selections, and solicit user data, respectively. Next, we define a struct called dbRecord, which resembles the user record type employed by the /etc/passwd file. This struct contains the following variables:

int uid int gid char username[8] char homeDirectory[64] char shell[64] char comment[64]

time, crystals should start to grow pull the skewer up slowly, bit by bit, so that the growing crystal is still in contact with the sugar solution. This is just like the way that silicon is grown. The silicon is drawn up slowly from a bath of molten hot silicon (which is analogous to our saturated sugar solution). This is shown in Figure 10-8.

Stores the user s ID Stores the user s primary group ID Defines the login for the user Stores the full path to the user s home directory Contains the full path to the user s default shell Stores the user s full name and optionally a description of some kind

Next, we introduce the main body of the program, beginning with the declaration of a file handle dbFile. This is a file in which user data will be stored using a binary format, and its name is retrieved from argv[1] (i.e., passed on the command line). After the file is opened for appending and reading, as signified by the permission string a+, a do...while loop is constructed. The loop iterates until menuChoice, as entered by the user after the menu is printed, is q. In practice, this condition is never reached, because the q is caught by the switch statement, and the case q immediately exits from the program. If the case e is encountered, the function enterData(FILE *fp) is called. This function proceeds by asking the user to enter all data elements that are defined for dbRecord. Each entry is read in by using the scanf function. Once the data has been collected, a record is written to the specified file by using the fwrite() function. Let s see how a data operation performs in practice:

$ ./database database.txt Database Main Menu -----------------(e)nter new record (q)uit Your Choice:

After selecting e, the Data Entry menu is displayed, and a new record can be inserted:

Data Entry---------Enter UID: 1001 Enter GID: 100 Enter username: pwatters Enter full name: Paul Enter shell: /bin/sh Enter home directory: /home/paul

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Slicing an egg with an egg slicer is much like the process that happens when a solar cell is manufactured. Each slice of silicon is then called a wafer. We now need to create a p n junction in the wafer; to do this phosphorus is diffused into the surface of the silicon. Dip your egg into some food coloring or beetroot juice, and you will see that the juice covers one surface of the egg slice. Now, imagine that slice of egg were a solar cell, with the beetroot-soaked face pointing toward the light. Imagine an electrical contact on either side of the egg slice is connected to our circuit. The photons

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