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checked/sanitized, so it is possible for an attacker to run arbitrary evil commands via the check_nrpe command. It s up to you how you assess risk in your own setup and with the specific command that you re using. You should certainly at least understand what the command you re passing in to check_nrpe will do with the options you provide. In the previous example, check_nrpe!check_disk will just run the check_disk command without any arguments on the monitored machine, with whatever disk is hard-coded in that command to be checked. check_nrpe!check_disk!/ will pass the third argument (here /) to check_disk, and check_disk will operate on that argument. If your check_disk command involved, say, an echo line, and the argument was, instead of a disk mount point, some malicious code, then the malicious code could be echoed and thus run.

Listing 8-47. Expansion to an Outer Join with a UNION Operator SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 15 select , , from , where group by , union select , , from where d.deptno d.dname count(e.empno) as headcount employees e departments d e.deptno = d.deptno d.deptno d.dname x.deptno x.dname 0 as headcount departments x x.deptno not in (select y.deptno from employees y);

That can t be right, though. We re looking for a tile s x coordinate, which is never a fractional number! The reason is, of course, that the touch was somewhere inside the tile we re looking for (i.e., inside a 32 32 square area). The simple trick of casting the result to an int value will get rid of the fractional part and assign this to pos.x:

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The following exercises will help you to better understand the topics covered in this chapter The answers are presented in Appendix D 1 Produce an overview of all course offerings Provide the course code, begin date, course duration, and name of the trainer 2 Provide an overview, in two columns, showing the names of all employees who ever attended an SQL course, with the name of the trainer 3 For all employees, list their name, initials, and yearly salary (including bonus and commission) 4 For all course offerings, list the course code, begin date, and number of registrations Sort your results on the number of registrations, from high to low 5 List the course code, begin date, and number of registrations for all course offerings in 1999 with at least three registrations 6.

/etc/nagios/nrpe-local.cfg. NRPE will check both files (/etc/nagios/nrpe.cfg and /etc/nagios/ nrpe-local.cfg), but if there is a conflict, /etc/nagios/nrpe-local.cfg will win. This has the advantage

Casting to an int will remove the fractional part. You can safely get rid of the fractional part because it s simply not relevant actually it s harmful. If you didn t cast away the fractional part but used the noninteger coordinate, in this example 10.625, to try to retrieve the tile at a tile coordinate 10.625, you d receive a runtime error because there is only a tile at x coordinates 10 and 11, not at 10.625.

Provide the employee numbers of all employees who ever taught a course as a trainer, but never attended a course as an attendee 7 Which employees attended a specific course more than once 8 For all trainers, provide their name and initials, the number of courses they taught, the total number of students they had in their classes, and the average evaluation rating Round the evaluation ratings to one decimal 9 List the name and initials of all trainers who ever had their own manager as a student in a general course (category GEN) 10 Did we ever use two classrooms at the same time in the same course location 11 Produce a matrix report (one column per department, one row for each job) where each cell shows the number of employees for a specific department and a specific job.

A slightly more complicated calculation is used to get the tile s y coordinate:

of keeping your local changes separate from the package files, so if the package is updated, there s no risk of your changes being overwritten. Similarly, you can keep files in /etc/nagios/nrpe.d/.

In a single SQL statement, it is impossible to dynamically derive the number of columns needed, so you may assume you have three departments only: 10, 20, and 30 12 Listing 8-26 produces information about all departments with more than four employees How can you change the query to show information about all departments with fewer than four employees 13 Look at Listings 8-44 and 8-45 Are those two queries logically equivalent Investigate the two queries and explain the differences, if any..

pos.y = (int)((tileMap.mapSize.height * tileMap.tileSize.height - pos.y) / tileMap.tileSize.height);

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