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open(GZDATA,"-|") or exec 'gzcat', 'filegz';

Injury to the ophthalmic and maxillary divisions of the trigeminal nerve may be the result of either a basal fracture across the middle cranial fossa or a direct extracranial injury to the branches of the nerves Numbness and paresthesias of the skin supplied by the nerve(s) or a neuralgia can be troublesome sequelae of these injuries The facial nerve may be involved in one of two ways In the rst type of injury, associated with transverse fractures through the petrous bone, there is an immediate facial palsy, probably due to contusion or transection of the nerve Surgical anastomosis has sometimes been successful in this circumstance The second, more common type, is associated with longitudinal fractures of the petrous bone, the facial palsy then often being delayed for several days a sequence that may be misinterpreted as progression of the intracranial traumatic lesion This latter type is usually transitory, and its mechanism is not known Injury to the eighth cranial nerve due to petrous fractures results in a loss of hearing or in postural vertigo and nystagmus coming on immediately after the trauma Deafness due to nerve injury must be distinguished from the high-tone hearing loss due to cochlear injury and from deafness caused by bleeding into the

I , Jo :

This example forks a new process and immediately executes gzcat, with its standard output redirected to the GZDATA filehandle The method is simple to remember If you open a pipe to minus, you can write to the filehandle, and the child process will receive the information in its STDIN Opening a pipe from minus enables you to read information that the child sends to its STDOUT from the opened filehandle This can be useful in situations where you want to execute a piped command when running as a setuid script More useful in general, though, is the fact that you can use this in combination with exec to ensure that the current shell does not parse the command you are trying to run Here s a more obvious version of the previous example that also takes care of the setuid permission status:

If the skin over a skull fracture is lacerated and the underlying meninges are torn, or if the fracture passes through the inner wall of a paranasal sinus, bacteria may enter the cranial cavity, with resulting meningitis or abscess formation Also, CSF that leaks into the sinus present as a watery discharge from the nose (CSF rhinorrhea) The nasal discharge can be identi ed as CSF by testing it for glucose with diabetic test tape (mucus has no glucose) or by the presence of uorescein or iodinated water-soluble dye that is injected into the lumbar subarachnoid space and then absorbed by pledgets placed in the nasal cavity Most cases of acute CSF rhinorrhea heal by themselves If the condition is persistent or is complicated by an episode of meningitis, repair of the torn dura mater is indicated The prophylactic use of antibiotics to prevent meningitis from a nasal CSF leak is currently not favored, but many neurosurgeons continue this practice, particularly in children (see page 599) A collection of air in the cranial cavity (aerocele) is a common occurrence following skull fracture or following an extended neurosurgical procedure It is usually found (by CT scan) in the epidural or subdural space over the cerebral convexities or between the hemispheres and serves only to warn of a potential route for the entry of bacteria into the cranium Small collections of air are usually absorbed without incident, but a large collection of air may act as a mass and cause clinical deterioration after injury (tension pneumocranium; Fig 35-3) Inhalation of 100% oxygen has a salutary effect, but needle aspiration of the air is required if it is causing clinical signs (Fig 35-3)

$child = open(GZCAT, "-|"); if ($pid) { while(<GZCAT>) { print $_; } close(<GZCAT>); } else { ($EUID, $EGID) = ($UID, $GID); exec 'gzcat', 'filegz'; }

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Figure 35-3 CT of postoperative tension pneumocranium (aerocele) that caused progressive drowsiness and required removal by aspiration The air is apparent as a very low density collection that compresses the frontal lobes

Here, the exec d program will be sending its output (a decompressed version of filegz) to the standard output, which has in turn been piped through the GZCAT filehandle in the parent In essence, this is no different from a standard piped open, except that you guarantee that the shell doesn t mess with the arguments you supply to the function

Depressed ( derby hat ) fractures are of signi cance only if the underlying dura is lacerated or the brain is compressed by indentation of bone They should then be surgically repaired, preferably within the rst 24 to 48 h

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There are times when you want to run an external program but are not interested in the specifics of the output information, or if you are interested, you do not expect vast amounts of data that needs to be processed In these situations, a number of avenues are open to you It s also possible that you want to create your own subprocess, purely for your own use You ve already seen some examples of this throughout this book We ll look at both techniques in this section