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NAME

     File::Copy - Copy files or filehandles



SYNOPSIS
             use File::Copy;

             copy("file1","file2");
             copy("Copy.pm",\*STDOUT);'
             move("/dev1/fileA","/dev2/fileB");

             use POSIX;
             use File::Copy cp;

             $n=FileHandle->new("/dev/null","r");
             cp($n,"x");'




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

     o   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 second
         argument will be written to (and created if need be).

         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.

     o   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
         (possibly 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 systems, this is
     equivalent to the simple copy routine.  For VMS systems,
     this calls the rmscopy routine (see below).  For OS/2
     systems, this calls the syscopy XSUB directly.

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

     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 parameter 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).

     rmscopy($from,$to[,$date_flag])
         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 timestamps 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.



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



AUTHOR
     File::Copy was written by Aaron Sherman <ajs@ajs.com> in
     1995, and updated by Charles Bailey
     <bailey@newman.upenn.edu> in 1996.









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