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Create new group Delete specified group Display groups the specified user belongs to Compress files and replace original file with compressed version Initiate shutdown procedure, ending all processes and unmounting all disks Dangerous! Tweak or view hard disk settings Print topmost lines of text files (default is first 10 lines) Display list of common BASH commands Display history file (a list of recently used commands) Query DNS server based on specified domain name or IP address -d: Verbose; return more information -r: Force name server to return its cached information rather than query other authoritative servers -n: Specify number of lines (such as -n 5) -d: Decompress specified file -v: Verbose; display degree of compression -p: Power off system at end of shutdown procedure

# hdparm *

bit about some when the time is relevant. The true flexibility of PAM is in its modules which you can find in /lib/security. Each of these modules has a specific function. The next section provides a short description of some of the more interesting modules. But, before we dive into that, you ll quickly learn how to set a secure default policy.

Display username and group info of specified user (or current user if none specified) Display or configure settings of a network interface (assign an IP address or a subnet mask, and activate/deactivate it) Display info page for specified command Change current run level Display list of jobs running in background Kill specified process Kill process(es) that have specified name(s)

Lisitng 6-4. Just One Join Between the Tables (But with a Complex Condition) SELECT * FROM Member m INNER JOIN Team t ON (m.MemberID = t.Manager) AND (m.Team = t.TeamName)

In a PAM environment, every service should have its own configuration for PAM. However, the world isn t perfect, and a given service may not have a PAM configuration. In this case, I recommend creating /etc/pam.d/other as a PAM configuration file. This file is processed by all PAM applications that don t have their own configuration file. If you really want to know if your system is secure, give it the contents as detailed in Listing 5-11. Listing 5-11. Configuring PAM for Security in /etc/pam.d/other auth auth account account password password session session required required required required required required required required pam_warn.so pam_deny.so pam_warn.so pam_deny.so pam_warn.so pam_deny.so pam_warn.so pam_deny.so

# ifconfig *

down: Disable interface (used at end of command chain) netmask: Specify a subnet mask up: Enable interface (used at end of command chain)

All four phases in the authentication process call two modules: pam_warn and pam_deny. The pam_warn module generates a warning and writes that to your log environment (/var/log/ messages by default). Next, for all of these instances, the module pam_deny is called. This simple module will just deny everything. The results All modules will handle authentication properly, as defined in their own configuration file, but, when that file is absent, this generic configuration will make sure that all access is denied.

$ info *

Figure 6-7. Just one join between the tables but with a complex condition (Listing 6-4)

kill 1433 -i: Confirm before killing process -v: Verbose; report if and when successful killall processnumber

Want to know if a program is PAM enabled Use ldd programname. For example, use ldd Tip /usr/bin/passwd to find the library files used by this command. If the modules libpam_misc and libpam

Display details of recent logins, reboots, and shutdowns Display system files (libraries) required by specified program Interactively scroll through a text file -q: Quiet; disable beeps when end of file is reached or other error encountered -i: Ignore case; make all searches case insensitive unless uppercase letters are used -s: Create symbolic link (default is hard link)

To understand what is happening with the join in Listing 6-4 and Figure 6-7, consider first the Cartesian product of Member and Team. The Cartesian product gives us every combination of rows from each table. The join condition says only rows where the MemberID is the same as the Manager and Team and TeamName are the same. In everyday language, this amounts to Show me the members who manage the team they are in. For our data, that is just the single row for Brenda Nolan we see in Figure 6-7. This can be disconcerting for beginners, who quite rightly wonder what happened to all the other team members. In Access, you must manually remove one of the join conditions and add another copy of the Member table, as in Figure 6-5.