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Reference
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See File::Spec
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File::Spec::OS2
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This module supports methods for manipulating file specifications under the OS/2 platform
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use File::Spec::OS2;
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It overrides the default methods supported by File::Spec Note that you should not normally need to use this module directory The supported methods are detailed in the File::Spec:Unix module
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Reference
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See File::Spec
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APPENDIXES
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File::Spec::Unix
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This module supports Unix-specific methods for file specifications
use File::Spec::Unix;
Perl: The Complete Reference
It imports and overrides the methods supported by File::Spec It is normally imported by File::Spec as needed, although you can import it directly if required The following methods are supplied
canonpath
cleans up a given path, removing successive slashes and / Note that the physical existence of the file or directory is not verified
catdir
concatenates one or more directories into a valid path This strips the trailing slash off the path for all but the root directory
catfile
concatenates one or more directories and a file name into a valid path to a file
curdir
returns a string representing the current directory ()
rootdir
returns a string representing the root directory (/)
updir
returns a string representing the parent directory ( )
no_upwards
removes references to parent directories from a given list of file paths
file_name_if_absolute
returns true if the given path is absolute
Appendix B:
Standard Perl Library
path
returns the $ENV{PATH} variable as a list
join
is identical to catfile
References
See File::Spec
File::Spec::VMS
This module supports VMS-specific methods for file specifications
use File::Spec::VMS;
It is imported and overrides the methods supplied by File::Spec under the VMS platform The following methods are supported
catdir LIST
concatenates a list of specifications and returns a VMS syntax directory specification
catfile LIST
concatenates a list of specifications and returns a VMS syntax file specification
curdir
returns the current directory as a string
rootdir APPENDIXES
returns the root directory as a string
updir
returns the parent directory as a string
Perl: The Complete Reference
path
translates the logical VMS path defined in DCL$PATH rather than splitting the value of $ENV{PATH}
file_name_is_absolute
checks that a VMS directory specification is valid Note that this does not check the physical existence of a file or directory, only that the specification is correct
Reference
See File::Spec
File::Spec::Win32
This module provides Win32-specific methods for file specifications
use File::Spec::Win32;
This is the module imported internally by File::Spec under Win32 platforms The package overrides the following methods supported by the File::Spec module
Catfile LIST
concatenates one or more directory names and a file name to form a complete path to a file
canonpath EXPR
cleans up a supplied pathname for use on Win32 platforms
Reference
See File::Spec
FindBin
This module exports variables that define the directory of the original Perl script
use FindBin;
Appendix B:
Standard Perl Library
It locates the full path to the script s parent directory, as well as the name of the script This can be useful if you want to install a script in its own directory hierarchy but do not want to hard code the directory location into the script The variables available are shown in Table B-6 The variables are not exported by default; you must explicitly request them or use the fully qualified values Note that if the script was invoked from STDIN or via the -e command line option, the value of $Bin is set to the current directory
GDBM_File
This module provides an interface to the GDBM database system The main benefit of GDBM over other systems (except Berkeley DB) is that it provides rudimentary database locking and does not have a restricted bucket size, allowing you to store any size object within a GDBM database
use GDBM_File; tie %db, 'GDBM_File', 'db', &GDBM_WRCREAT, 0640; untie %db;
Instead of using the modes for opening the database that are ordinarily supplied by the Fcntl module, the GDBM_File module provides its own constants, listed in Table C-7
References
SDBM_File
13; see also AnyDBM_File, DB_File, NDBM_File, ODBM_File,
Variable
$Bin $Script $RealBin $RealScript Table B-6
Description
Path to the directory where the script was located The name of the script that was invoked The value of $Bin with all the links resolved
APPENDIXES
The value of $Script with all the links resolved
Variables Available via FindBin
Perl: The Complete Reference
Constant
GDBM_READER GDBM_WRITER GDBM_WRCREAT GDBM_NEWDB
Description
Open for read only Open for read/write Open for read/write, creating a new database if it does not already exist, using the mode specified Open for read/write, creating a new database even if one already exists, using the mode specified
Table B-7
Modes for Opening GDBM Tied Databases
Getopt::Long
This module is suitable for simple scripts and argument passing However, it falls over if you try to do more complex processing or want to place the extracted information into specific variables and structures The Getopt::Long module implements a more advanced system It is POSIX compliant and, therefore, suitable for use in scripts that require POSIX compliance POSIX compliance allows not only the standard single-character matching supported by the Getopt::Std module, but also string arguments For example:
$ scriptpl --inputfile=sourcetxt
The command line option in this case is inputfile Note that long names as arguments are supported by both the single and double hyphen, although the double hyphen is the POSIX default The + sign is also supported, but the use of this is deprecated and not part of the POSIX specification The selection of additional arguments to command line options is supported by appending a specific character sequence to the end of the option name The list of available modifiers is defined in Table B-8 Any elements in the argument list not identified as options remain in the @ARGV array
Appendix B:
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