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The sudo command checks the /etc/sudoers file for the authorization to run commands. You can configure the sudoers file to restrict access to particular users, to certain commands, and on particular hosts. Let s look at Listing 1-32 to see how to use sudo. I am logged onto the system as the user bob. Listing 1-32. Using sudo puppy$ cat /var/log/secure cat: /var/log/secure: Permission denied puppy$ sudo cat /var/log/secure Password: In the first command in Listing 1-32, I try to cat the /var/log/secure, which would normally be accessible only by root. As you can see, I get a permission-denied error, which is the result I expect. Then I try again, prefixing the command with the sudo command. You will be prompted for your password (not the root password). If you have been authorized to use sudo and authorized to use the cat command as root on this system, then you would be able to view the file.

When using PLINQ, it is important to ensure that your query does not modify the result set because this might have unforeseen effects if values are utilized later in the query. PLINQ will do its best to work out best how to process the query (including not running it in parallel at all), but do you really want to take the chance of weird, scary, and hardto-reproduce bugs

s Note You can also run sudo using a time limit. You can specify that for a defined time period after executing the sudo command the user can act as root. I do not recommend configuring sudo this way because it creates similar issues to simply using the root user for administration. But if you want to configure it like this, you can see how to do it in the sudo man page.

Let s look at what you need to add to the /etc/sudoers file to get Listing 1-32 to work. You need to use the command visudo to edit the /etc/sudoers file. The visudo command is the safest way to edit the sudoers file. The command locks the file against multiple simultaneous edits, provides basic sanity checks, and checks for any parse errors. If the file is currently being edited, you will receive a message to try again later. I have added the content of Listing 1-33 to the sudoers file. Listing 1-33. Sample sudoers Line bob ALL=/bin/cat We can break this line down into its component parts. username host = command Listing 1-33 shows the user bob is allowed to, on all hosts (using the variable ALL), use the command /bin/cat as if he were root. Any command you specify in the command option must be defined with its full path. You can also specify more than one command, each separated by commas, to be authorized for use, as you can see on the next line: bob ALL=/bin/cat,/sbin/shutdown,/sbin/poweroff

In the previous line bob is now authorized to use the cat, shutdown, and poweroff commands as if he were the root user All configuration lines in the sudoers file must be on one line only, and you can use the \ to indicate the configuration continues on the next line A single sudoers file is designed to be used on multiple systems Thus, it allows host specific access controls You would change your sudoers file on a central system and distribute the updated file to all your systems With host access controls you can define different authorizations for different systems, as you can see in Listing 1-34 Listing 1-34.

This example iterates through all the objects in the stock list, calls an external service, and processes the result. Writing such a query in traditional LINQ might look something like this: var query = from s in Stocks let result = StockService.CallService(s) select result; To run the same query in parallel, simply use the .AsParallel() extension method to the Stocks object: var query = from s in Stocks.AsParallel() let result = StockService.CallService(s) select result; It really is as easy as that (well almost...).