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This is the postfix daemon, which looks after mail. This user can t log in because its shell is /bin/false, but its home directory is /var/spool/postfix, and it owns the spool directories in which mail being sent and delivered is held. The fact that these directories are owned by the user postfix rather than by root is a security feature it means that any possible vulnerability in postfix is less likely to lead to a subversion of the whole system. Similar system users exist for the web server (the user wwwrun) and various other services. You won t often need to consider these, but it is important to understand that they exist and that the correct ownerships of certain files and directories by these users is part of the overall security model of the system as a whole. Each user belongs to one or more groups. The groups on the system are listed in the file /etc/groups. To find out what groups you belong to, you can simply type the command groups (alternatively look at the file /etc/groups and look for your username). By default, on a SUSE system, you will find that you belong to the group users and also to a few system groups including the groups dialout and audio. This is to give normal human users the right to use the modem and sound devices (which is arranged through file permissions as you shall see later in this chapter).

You can most simply create a new user using YaST s user module. Start YaST and choose the users and groups option. You might want to create a user with the username guest and the real name Guest User. YaST will create the user according to your instructions and also create a home directory /home/guest for the new user with a skeleton of configuration files in it. This skeleton is copied from the directory /etc/skel but has the ownership of the new user (user guest, group users) applied to it once the new user s home directory has been created. You can also create a new user from the command line with the command useradd. The equivalent command would be:

I tend to classify all such inexplicable occurrences under the heading 'cosmic ray'.

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The function has one parameter. Each individual is therefore represented by a vector consisting of one floating-point element (not binary encoded). The initial population is generated randomly, with each individual's parameter Cnx selected such that Cnx ~ Z7(0,2).

If your company uses a proxy, or you use a proxy at home, you can set a global system proxy that a large proportion of network utilities will try to honor. You can set up either an anonymous proxy or one with user credentials. The proxy configuration itself is not intelligent because all it does is inform your applications that the proxy should be a certain host with a username and password (if specified). It does not impact how the application communicates with the server. To set up your proxy configuration, select the Network Services icon after starting YaST, and select Proxy from the right pane. Next, enter your server addresses for your HTTP and FTP proxying services. If you need to configure a specific port number on your proxy, you can add this by appending a colon to the host name with the port number, as in Figure 9-6.

Usually this is not the case, though; most problems are reproducible with sufficient time and imagination Trying to establish probable cause in such a web of intrigue as a computer system is enough to task the best detectives Indeed, we shall return to this point in 11, and consider the nature of the problems in more detail To employ a tried and tested stategy, in the spirit of Sherlock Holmes, we can gradually eliminate possibilities and therefore isolate the problem, little by little This requires a certain inspiration for hypothesizing causes which can be found from any number of sources: One should pay attention to all the facts available about the problem If users have reported it, then one should take seriously what they have to say, but always attempt to verify the facts before taking too much on trust.

Network Time Protocol (NTP) synchronizes your machine time with a centralized time server of your choosing. Time servers available on the Internet are usually a secondary source to a machine that acts as a central time server. Central (or primary) time servers are usually linked into an extremely accurate clock mechanism. To specify an NTP time source, select the Network Service icon in the left pane after starting YaST and then select the NTP Client option from the right pane.

Selecting the NTP Client option causes you to be prompted for the host name of an NTP source (see Figure 9-7). An excellent list of NTP primary and secondary sources is available at www.eecis.udel.edu/~mills/ntp/clock2b.html. To ensure that your system automatically synchronizes itself with an NTP server, you should select the When Booting System radio button the default selection is Never, which effectively disables the use of NTP by your system.

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