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Perl6::Overview::File - File and Filesystem operations
Structure

=head1 DESCRIPTION

=head2 Files
     
    FH = open FILENAME, MODE
    # FH is the returned filehandle
    # FILENAME is, well the name of the file
    # MODE can be :r :w :a :rw
    # if MODE left out it defaults to :r
    
    my $fh = open "filename", :r err die "Could not open file $!";

    my $row = =$fh;                           # reading a line

    my @rows = =$fh;                          # reading all the lines

    my $content = slurp "filename";
                    # slurp the content of a file into a scalar variable

    close $fh;
    
=head2 Directories

    my $dh = opendir "dirname" err die "Could not open directory $!";

    my @files = readdir($dh);
    my @files = $dh.readdir;
    
    for $dh.readdir -> $entry {  # read them one-by-one
        say $entry;
    }

    closedir($dh);
    $dh.closedir;

    rewinddir($dh);               # start from the beginning
    $dh.rewinddir;

=head2 File and Directory tests
    -e "thing"                    # true if thing exists in the filesystem
    -d "thing"                    # true on directories
    -f "thing"                    # true on files
    -r "thing"                    # true on readable files/directories
    -w "thing"                    # true on writable files/directories
    -x "thing"                    # true on executable files/directories

    -z "file"                     # true if size is 0
    -s "file"                     # returns file size in bytes


    mkdir "dirname"
    rmdir "dirname"
    chdir "dirname"

    unlink
    chmod
    chown