Man Pages

File::Copy(3) - phpMan File::Copy(3) - phpMan

Command: man perldoc info search(apropos)  

File::Copy(3)          Perl Programmers Reference Guide          File::Copy(3)

       File::Copy - Copy files or filehandles

               use File::Copy;

               copy("file1","file2") or die "Copy failed: $!";

               use File::Copy "cp";

               $n = FileHandle->new("/a/file","r");

       The File::Copy module provides two basic functions, "copy" and "move", which are useful for getting the con-
       tents of a file from one place to another.

       ?   The "copy" function takes two parameters: a file to copy from and a file to copy to. Either argument may be
           a string, a FileHandle reference or a FileHandle glob. Obviously, if the first argument is a filehandle of
           some sort, it will be read from, and if it is a file name it will be opened for reading. Likewise, the sec-
           ond argument will be written to (and created if need be).  Trying to copy a file on top of itself is a
           fatal error.

           Note that passing in files as handles instead of names may lead to loss of information on some operating
           systems; it is recommended that you use file names whenever possible.  Files are opened in binary mode
           where applicable.  To get a consistent behaviour when copying from a filehandle to a file, use "binmode" on
           the filehandle.

           An optional third parameter can be used to specify the buffer size used for copying. This is the number of
           bytes from the first file, that wil be held in memory at any given time, before being written to the second
           file. The default buffer size depends upon the file, but will generally be the whole file (up to 2Mb), or
           1k for filehandles that do not reference files (eg. sockets).

           You may use the syntax "use File::Copy "cp"" to get at the "cp" alias for this function. The syntax is
           exactly the same.

       ?   The "move" function also takes two parameters: the current name and the intended name of the file to be
           moved.  If the destination already exists and is a directory, and the source is not a directory, then the
           source file will be renamed into the directory specified by the destination.

           If possible, move() will simply rename the file.  Otherwise, it copies the file to the new location and
           deletes the original.  If an error occurs during this copy-and-delete process, you may be left with a (pos-
           sibly partial) copy of the file under the destination name.

           You may use the "mv" alias for this function in the same way that you may use the "cp" alias for "copy".

       File::Copy also provides the "syscopy" routine, which copies the file specified in the first parameter to the
       file specified in the second parameter, preserving OS-specific attributes and file structure.  For Unix sys-
       tems, this is equivalent to the simple "copy" routine, which doesn't preserve OS-specific attributes.  For VMS
       systems, this calls the "rmscopy" routine (see below).  For OS/2 systems, this calls the "syscopy" XSUB
       directly. For Win32 systems, this calls "Win32::CopyFile".

       On Mac OS (Classic), "syscopy" calls "Mac::MoreFiles::FSpFileCopy", if available.

       Special behaviour if "syscopy" is defined (OS/2, VMS and Win32)

       If both arguments to "copy" are not file handles, then "copy" will perform a "system copy" of the input file to
       a new output file, in order to preserve file attributes, indexed file structure, etc.  The buffer size parame-
       ter is ignored.  If either argument to "copy" is a handle to an opened file, then data is copied using Perl
       operators, and no effort is made to preserve file attributes or record structure.

       The system copy routine may also be called directly under VMS and OS/2 as "File::Copy::syscopy" (or under VMS
       as "File::Copy::rmscopy", which is the routine that does the actual work for syscopy).

           The first and second arguments may be strings, typeglobs, typeglob references, or objects inheriting from
           IO::Handle; they are used in all cases to obtain the filespec of the input and output files, respectively.
           The name and type of the input file are used as defaults for the output file, if necessary.

           A new version of the output file is always created, which inherits the structure and RMS attributes of the
           input file, except for owner and protections (and possibly timestamps; see below).  All data from the input
           file is copied to the output file; if either of the first two parameters to "rmscopy" is a file handle, its
           position is unchanged.  (Note that this means a file handle pointing to the output file will be associated
           with an old version of that file after "rmscopy" returns, not the newly created version.)

           The third parameter is an integer flag, which tells "rmscopy" how to handle timestamps.  If it is < 0, none
           of the input file's timestamps are propagated to the output file.  If it is > 0, then it is interpreted as
           a bitmask: if bit 0 (the LSB) is set, then timestamps other than the revision date are propagated; if bit 1
           is set, the revision date is propagated.  If the third parameter to "rmscopy" is 0, then it behaves much
           like the DCL COPY command: if the name or type of the output file was explicitly specified, then no times-
           tamps are propagated, but if they were taken implicitly from the input filespec, then all timestamps other
           than the revision date are propagated.  If this parameter is not supplied, it defaults to 0.

           Like "copy", "rmscopy" returns 1 on success.  If an error occurs, it sets $!, deletes the output file, and
           returns 0.

       All functions return 1 on success, 0 on failure.  $! will be set if an error was encountered.

       ?   On Mac OS (Classic), the path separator is ':', not '/', and the current directory is denoted as ':', not
           '.'. You should be careful about specifying relative pathnames. While a full path always begins with a vol-
           ume name, a relative pathname should always begin with a ':'.  If specifying a volume name only, a trailing
           ':' is required.


             copy("file1", "tmp");        # creates the file 'tmp' in the current directory
             copy("file1", ":tmp:");      # creates :tmp:file1
             copy("file1", ":tmp");       # same as above
             copy("file1", "tmp");        # same as above, if 'tmp' is a directory (but don't do
                                          # that, since it may cause confusion, see example #1)
             copy("file1", "tmp:file1");  # error, since 'tmp:' is not a volume
             copy("file1", ":tmp:file1"); # ok, partial path
             copy("file1", "DataHD:");    # creates DataHD:file1

             move("MacintoshHD:fileA", "DataHD:fileB"); # moves (don't copies) files from one
                                                        # volume to another

       File::Copy was written by Aaron Sherman <> in 1995, and updated by Charles Bailey <bailey@new-> in 1996.

perl v5.8.8                       2001-09-21                     File::Copy(3)