Why I Like Perl

Handy Shortcuts

$_ is the default variable
- kind of like a pronoun
- called "topic" in Perl 6
- default value when you don't specify one
```
  while (<>)
  {
      s/PERL/Perl/g;
      print;
  }
```
<> reads from @ARGV, a line at a time, a file at a time
while() loops through all lines until it hits the end of all files
substitution operator works on $_ by default
print operator prints $_ by default

Slide 31 of 47