Unix/Linux Go Back    

CentOS 7.0 - man page for file::copy (centos section 3pm)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

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

       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 contents 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 second argument
	   will be written to (and created if need be).  Trying to copy a file on top of itself
	   is a fatal error.

	   If the destination (second argument) already exists and is a directory, and the source
	   (first argument) is not a filehandle, then the source file will be copied into the
	   directory specified by the destination, using the same base name as the source file.
	   It's a failure to have a filehandle as the source when the destination is a directory.

	   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 will 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 behavior is nearly the same as well: as
	   of version 2.15, <cp> will preserve the source file's permission bits like the shell
	   utility cp(1) would do, while "copy" uses the default permissions for the target file
	   (which may depend on the process' "umask", file ownership, inherited ACLs, etc.).  If
	   an error occurs in setting permissions, "cp" will return 0, regardless of whether the
	   file was successfully copied.

	   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, 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".

	   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 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).

	   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.

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

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

perl v5.16.3				    2013-03-04				  File::Copy(3pm)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 11:25 AM.