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The VAR parameter should be a suitable scalar variable to hold the buffer data, and SIZE defines the maximum size of the buffer The TYPE is specified using a constant, and these are exported by default by the module The constants are described in Table B-5
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Causes the input and output to be fully buffered Causes the output to be line buffered The buffer will be flushed when a newline character is written to the filehandle, when the buffer is full, or when input is requested on the handle Causes the input and output to be completely unbuffered
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You should not modify the contents of the scalar variable you use for the buffer while it is in use The FileHandle module also supports the following methods, which are simply aliases for the corresponding functions See 3, 6, and/or Appendix A for more information on the following functions: clearerr gets close print eof printf fileno seek getc tell
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The module also supports methods for setting the individual variables that affect the use of the filehandle directly: autoflush format_line_break_characters format_lines_per_page format_page_number input_line_number output_field_separator format_formfeed format_lines_left format_name format_top_name input_record_separator output_record_separator
Finally, the module also supports two further methods for reading lines from the file:
$fh->getline $fh->getlines
Appendix B:
Standard Perl Library
The getline method returns a single line from the filehandle, just like the <$fh> operator when used in a scalar context The getlines method returns a list of lines in a manner identical to the <$fh> operator in a list context The getlines method will croak if called in a scalar context
References
8; see also Symbol, POSIX
File::Basename
This module supports the basename and dirname functions for extracting file and directory names for complete paths It also supports more complex file path parsing functions
use File::Basename;
The File::Basename module supplies functions for parsing pathnames and extracting the directory; the file name; and, optionally, the extension The extraction can be made to account for different operating systems and can, therefore, be used as a cross-platform tool for parsing paths The main function is fileparse:
fileparse PATH, EXTENSION
The fileparse function separates PATH into its components: a directory name, a file name, and a suffix The directory name should contain everything up to and including the last directory separator in PATH The remainder is then separated into the file name and suffix based on the EXTENSION definitions you supply This argument should be a reference to an array, in which each element is a regular expression used to match against the end of the file name If the match succeeds, the file is split into its file name and extension If it does not match, the whole file name is returned and the suffix remains empty For example:
($name, $path, $suffix) = fileparse('/usr/local/bin/scriptpl', '\pl'); APPENDIXES
This will return script, /usr/local/bin/, and pl, in that order Note that this is not the same as the order you might expect The function guarantees that if you combine the three elements returned, you will end up with the original file path
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The syntax used to separate the path depends on the setting of the module You can change the specification syntax using the fileparse_set_fstype function:
fileparse_set_fstype EXPR
The supplied expression defines the operating system syntax to be used If EXPR contains one of the substrings VMS, MSDOS, or MacOS, then the corresponding syntax is used in all future calls to the fileparse function If EXPR does not contain one of these strings, the Unix syntax is used instead Note that the default operation depends on the value of $Config{osname} as determined during the build process Two functions, basename and dirname, are supplied for Unix compatibility:
basename EXPR
The basename function returns the file name of a path The function uses fileparse for its result
dirname EXPR
The dirname function returns the directory portion of a file path The result depends on the current syntax being used to extract the information When using VMS or MacOS, the result is the same as the second argument returned by fileparse If Unix or MSDOS syntax is used, the value matches what would be returned by the dirname Unix command The function uses fileparse for its result
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