How to open a file using PERL

Opening files with PERL is as easy.

There are three options to opening a file
 * 1) open to read
 * 2) open to write
 * 3) *creates a new file or erase previous contents
 * 4) open a file to append it
 * 5) * opens the file, reads it and writes to it


 * open(FILEVARIABLE, "< $filename")
 * open the file to read
 * @filelines= ;
 * reads the file into an array with each line being its content
 * close(FILEVARIABLE)
 * close the file

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