by André Batosti
revision: Vinny alves
To read or write files in Perl, you need to open a filehandle. Filehandles in Perl are yet another kind of identifier.
They act as convenient references (handles, if you will) between your program and the operating system about a particular file. They contain information about how the file was opened and how far along you are in reading (or writing) the file. They also contain user-definable attributes about how the file is to be read or written.
To open a new file on system you need to create the filehandle for this file using the command open
The filehandle is the identifier that will describe the file and the pathname – the full path of the file you trying to open. Typically it is represented by a constant, but when working with complex programs, it is best to use a scalar variable in order to safely pass it from one subroutine or method to another.