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A filehandle is a named internal Perl structure that associates a physical file with a name A filehandle can be reused It is not permanently attached to a single file, nor is it permanently related to a particular file name The name of the filehandle and the name of the file are not related As far as Perl is concerned, all operating systems support three basic filehandles STDIN, STDOUT, and STDERR The exact interpretation of the filehandle and the device or file it is associated with depend on the OS and the Perl implementation Table 7-1 shows the relationship between Perl filehandles and the underlying C file descriptors Perl also supports a number of standard filehandles that provide access to files while in special command line modes (see 15), and when accessing information appended to a Perl script See the end of 4 for a list of standard variables and filehandles All filehandles are capable of read/write access, so you can read from and update any file or device associated with a filehandle However, when you associate a filehandle, you can specify the mode in which the filehandle is opened This option prevents you from accidentally updating or overwriting information in a file that you only wanted to read You can see from Table 7-1 the access modes for the standard filehandles All filehandles are by default buffered on both input and output In most cases, this helps to improve performance by reading more than is needed from the physical device, or by block writing to a physical device Information is buffered on a block-by-block basis (the underlying OS defines the block size) The only exception to this rule is STDOUT, which is buffered on a line basis: appending the newline character to a printed string will automatically flush the buffer You can switch the buffering for the currently selected filehandle by setting the value of the $| variable to any value other.

2 import rtutilsRemote; 3 public class Controller{ 4 public static void main(String[] args){ 5 Remote remote = new Remote(); 6 } }

STDIN STDOUT STDERR Table 7-1

0 1 2

than zero It s also possible to set the buffering on other files if you use the IO::Handle module with the autoflush method For example, the following code turns buffering off for the DOOR filehandle:

How Close Are You to Ready Practice Exam 2 Quick Answer Key Practice Exam 2: Answers Analyzing Your Results More Study Tips

use IO::Handle; open(DOOR,"<filein") or die "Couldn't open file"; autoflush DOOR 1;

To switch it back on again:

autoflush DOOR 0;

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In the preceding example, the arguments to open are placed in parentheses to ensure that the or operator checks the entire statement, not the value of the file name See Error Handling in 9 for more information on error handling skills A filehandle can be referred to by either a static token or an expression If an expression is specified, then the value of the expression is used as the filehandle name Note that a filehandle token does not have a special preceding character, as with a variable, and the name is written in uppercase This is to help separate a filehandle from a normal variable If the filehandle is referred to by an expression, then the result of the expression is used as the filehandle name The only limitation with a filehandle is that it cannot be supplied directly to a userdefined function In this instance you must use a typeglob This is a special type of identifier that enables you to refer to different types of variables by prefixing the name with an asterisk This allows a typeglob to refer to all, or any, of $name, @name, %name, or name with *name How the typeglob is used, and therefore which interpretation is employed, is at the discretion of the expression or statement using the typeglob See 6 for more information on the symbol table and the use of typeglobs in functions

As you take this exam, and perhaps the rest of the exams in this book, you might want to keep a test log In this log, you should record which questions you guessed on and which ones you knew without a doubt On these exams and on the real exam, it s sometimes possible to use a process of elimination or other test-taking techniques to help you guess a correct answer In practice, when you get to the real exam you ll want to do this if you hit a question that stumps you But for these practice exams, guessing defeats the whole purpose! So, keep your log

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