Basic I/O

• I/O is much more object-oriented

• open returns an IO object

• Mode specified as named argument to open

my $fh = open('foo.txt', :r);   # read
my $fh = open('foo.txt', :w);   # write
my $fh = open('foo.txt', :rw);  # read/write
my $fh = open('foo.txt', :a);   # append