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Caution To set quotas, the user you are setting quotas for must be known to the quota system. This is not done automatically. To make sure that new users are known to the quota system, you must initialize the quota system again after creating the new users. I recommend setting up a cron job (see the Setting the System to Your Hand section in 6 to do this automatically at a reasonable interval).

# fdisk *

When all the quotas have been set the way you want, you can use the repquota command to monitor the current quota settings for your users. For example, the repquota -aug command shows current quota settings for all users and groups on all volumes. Now that you ve set all the quotas you want to work with, you just have to start the quota service, and you ll do this with the /etc/init.d/quota start command.

$ find *

Listing 6-3. Joining an Additional Copy of the Member Table to See Names of Managers SELECT * FROM (Member m INNER JOIN Team t ON m.Team = t.TeamName) INNER JOIN Member m2 ON t.Manager = m2.MemberID

Find files by searching directories (starting in current directory)

In the normal situation, the local user database in the Linux files /etc/passwd and /etc/shadow is checked at login to a Linux workstation. In a network environment, however, the login program must fetch the required information from somewhere else (for example, an LDAP directory service such as OpenLDAP). But how does the login program know where it has to search for authentication information That s where the pluggable authentication modules (PAM) come in, and PAMs are what makes the login procedure on your workstation flexible. With PAM you can redirect any application that has to do anything related to authentication to any service that handles authentication. A PAM is used, for example, if you want to authenticate with a private key stored on a USB stick, to enable password requirements, to prevent the root user from establishing a telnet session, and in many other situations. The only thing you need is a PAM that supports your authentication method. The main advantage of a PAM is its modularity. In a PAM infrastructure, anything can be used for authentication, provided there s a PAM module for it. So, if you want to implement some kind of strong authentication, ask your supplier for a PAM module and it will work. PAM modules are stored in the directory /lib/security, and the configuration files specifying how these modules must be used (and by which procedures) are in /etc/pam.d. Listing 5-10 is an example of just such a configuration file, in which the login procedure learns that it first has to contact an LDAP server before trying any local login. Listing 5-10. Sample PAM Configuration File auth sufficient /lib/security/pam_ldap.so account sufficient /lib/security/pam_ldap.so password sufficient /lib/security/pam_ldap.so session optional /lib/security/pam_ldap.so

-maxdepth: Specify the number of subdirectory levels to delve into, starting from 1 (current directory) -name: Specify name of file to search for -type: Specify file types to be returned; -type d returns directories, and -type f returns only files -m: Show figures in MB -t: Total the columns at bottom of table

find -name "myfile"

(Listing 6-3)

auth requisite pam_unix2so auth required pam_securettyso auth required pam_nologinso #auth required pam_homecheckso auth required pam_envso auth required pam_mailso account required pam_unix2so password required pam_pwcheckso nullok password required pam_unix2so nullok use_first_pass use_authok session required pam_unix2so session required pam_limitsso The authentication process features four different instances, and these are reflected in Listing 5-10 Authentication is handled in the first instance; these are the lines that start with the keyword auth During the authentication phase, the user login name and password are first checked, followed by the validity of the account and other account-related parameters (such as login time restrictions) This happens in the lines that start with account Then, all settings relating to the password are verified (the lines that start with password).

# fsck *

Check file system for errors (usually run from rescue disc) FTP program for uploading/downloading to remote sites Show which processes are using a particular file or file system Create ISO image file from specified directory (usually for burning to disc with wodim) -v: Verbose; detailed output