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erl code can be executed in a number of different ways You can execute a script written in a text, supply a miniscript on the command line, or execute Perl scripts within other Perl scripts Using the embedding techniques we ll see in 20, you can even execute Perl statements and scripts within the confines of a C program The term advanced is perhaps a little over the top, but in this chapter we ll look at alternative methods for executing Perl subroutines and scripts beyond the normal direct interpretation of a file The first method we ll look at is using Perl on the command line, along with the options you can supply to Perl to change the way it operates For example, the -w command line option turns on warnings a list of problems that may exist in your script There are other tricks, though: you can use Perl on the command line as a form of scriptable editor and with only a few more keystrokes, it can even operate as a do it all utility We ll then move on to the use of threads a sort of miniprocess within the main execution of a script You can use threads as a way to execute a number of subroutines simultaneously without resorting to the complexities and overheads of the fork function we saw in 14 On suitable operating systems (thread support is very operating-system limited) this allows multiple operations to occur simultaneously a great way for handling complex GUIs or client/server systems It can also be used where you are processing many files simultaneously without using the round-robin approach of IO::Select We have already seen some examples of using the eval function, which effectively operates as another Perl interpreter The eval function has many uses, but its primary use is as an exception handler to trap operations that would otherwise cause the main interpreter to fail A good example here is calling a function that may not be supported on the current platform you call the function within an eval, and it s the embedded Perl interpreter that fails, not the interpreter running your script Finally, we ll consider the security implications of using Perl and how to get around them using the standard Perl distribution Perl has always supported a tainting mechanism, which highlights variables and information Perl considers possibly unsafe For a more secure environment, you can use the Safe module to create a new, unique compartment where you can restrict the list of available opcodes (the smallest executable part of a Perl script) This can reduce the resources and methods available to a script, preventing it from using functions, or even operators, that you do not want it to run.

Traumatic Coma Data Bank, the mortality rate in 163 patients who were initially comatose from a cranial gunshot wound was 88 percent more than twice the mortality that results from severe blunt head injury On emerging from coma, the patient passes through states of stupor, confusion, and amnesia, not unlike those following severe closed head injuries Headache, vomiting, vertigo, pallor, sweating, slowness of pulse, and elevation of blood pressure are other common ndings Focal or focal and generalized seizures occur in the early phase of the injury in some 15 to 20 percent of cases Recovery may take many months Frazier and Ingham comment on the loss of memory, slow cerebration, indifference, mild depression, inability to concentrate, sense of fatigue, irritability, vasomotor and cardiac instability, frequent seizures, headaches and giddiness, all reminiscent of the residual symptoms from severe closed head injury with contusions Every possible combination of focal cerebral symptoms may be caused by such lesions The classic articles by Feiring and Davidoff and also by Russell and by Teuber, listed at the end of this chapter, are still very useful references on this subject Epilepsy is the most troublesome sequela and is described below Ascroft and also Caveness, in reviewing World War II cases, found that approximately half of all patients with wounds that had penetrated the dura eventually developed epilepsy, most often focal in nature; the gures reported by Caveness for Korean War veterans are about the same CSF rhinorrhea, discussed earlier and in Chap 30, may occur as an acute manifestation of a penetrating injury that produces a fracture through the frontal, ethmoid, or sphenoid bones Cairns listed these acute cases as a separate group in his classi cation of CSF rhinorrheas, the others being (1) a delayed form after craniocerebral injury, (2) a form that follows sinus and cranial surgery, and (3) a spontaneous variety Pneumoencephalocele (aerocele) ie, air entering the cerebral subarachnoid space or ventricles spontaneously or as a result of sneezing or blowing the nose is evidence of an opening from the paranasal sinus through the dura, as mentioned earlier in relation to skull fracture (Fig 35-3) Crushing Injuries of the Skull Aside from the absence of concussion, these relatively rare cerebral lesions present no special clinical features or neurologic problems not already discussed Birth Injuries These involve a unique combination of physical forces and circulatory-oxygenation factors and are discussed separately in Chap 38.

During the normal execution process, Perl looks for a script in one of the following places, in this order: 1 On the command line (via the -e option)

F,IQ x, fn F, l(

.

15:

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