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Both the operator and function methods for file name globbing invoke a subshell in order to expand the pattern supplied to a suitable file list For quick searches, this is not a major issue, but because you are using an external application to produce the list, you may run into a combination of both performance and memory allocation problems This is definitely the case if your shell does not support large argument lists (and most shells don t) To get around this problem, you can use the opendir function set This facility is an interface to the underlying routines that the operating system supports, and it functions rather like a directory-specific filehandle In fact, you access it in a similar way, using a directory handle:

opendir readdir rewinddir telldir seekdir closedir DIRHANDLE, EXPR DIRHANDLE DIRHANDLE DIRHANDLE DIRHANDLE, POS DIRHANDLE

To use opendir, first you need to open the directory handle and associate it with the directory you want to examine The EXPR should be a directory name, not a file specification, since the function set does not handle file name globbing Once opened, subsequent reads to readdir on the specified filehandle return the next file name in the directory in a scalar context In a list context, the entire directory contents are returned Once you have finished reading the directory names, you need to close the directory handle To list the contents of the directory:

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Which statements are true (Choose all that apply) A An exception will be thrown on line 8 B The variable pw must be a String, not a char[] C No import statements are necessary for the code to compile D If the code compiles and is invoked, line 7 might never run E Without a third argument, the readPassword() method will echo the password the user types F If line 4 was replaced with the following code, the program would still compile: "Console c = new Console();" 29 Given that: Exception is the superclass of IOException, and IOException is the superclass of FileNotFoundException, and

opendir (DIR, '') or die "Couldn't open directory, $!"; while ($file = readdir DIR) { print "$file\n"; } close DIR;

.

This circumvents all of the memory problems associated with the globbing operator and function, since each entry of the directory is retrieved individually Because the process of reading in from a directory is associated with a specific directory handle, you can have multiple handles open simultaneously You can also record your position within a directory handle using the telldir function The return value is an integer representing the current location within the directory list held within the instance of the directory handle Unfortunately, even over short periods of time, this value is not guaranteed to actually return you to the location it originally indicated This is because the number of directory entries may increase or decrease in size between the time you obtain the position information and when you attempt to move to that position using the seekdir function The best solution in these instances is to record not the theoretical position within an arbitrary directory list, but instead the actual pathname and file name you want to store If all you want to do is start reading the directory entry list again, you can use the rewinddir function This resets the pointer within the directory handle to the start of the list without the file pattern being reevaluated Due to the nature of the directory handle system, a more reliable method for processing the same list of files a number of times is to use an array providing, as ever, that the list size is not so great that it starts eating up too much memory in the process To emulate the globbing features of the glob function, you will need to check each individual file name or pass the list returned by readdir through the grep function You can also use the opportunity to sort the list returned, since the readdir function does not return a sorted list For example, to print the list of C source code files, you might use.

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