#!/usr/bin/ruby -n

=begin

The -n command line option causes your Ruby script
to run once for each line of input (with the input
in the $_ variable. $_ is the default input and
pattern matching space, so it's used also on regular
expression checks, and as a default to print.

=end

($_ =~ /^\w*a\b/) and print
print if %r!^z!
$c += 1

# The BEGIN block runs before the main program
# The END block runs after the main program

BEGIN {
puts "The world is round"
$c = 0
}

END {
# $. is the number of lines read from the current input
puts "The #{$.} world is like a squashed melon #{$c} times"
}

=begin

Sample output

Dorothy:rn grahamellis$ ./c3.rb ../requests.xyz
The world is round
antonia Perl XML PHP Tcl/Tk MySQL
barbara Tcl/Tk Lua Ruby Java
delia XML PHP Java Lua
gloria XML Perl Tcl/Tk MySQL
nina Tcl/Tk Perl Lua Ruby
olivia MySQL Python Lua PHP
petra XML Tcl/Tk Lua Perl Ruby
rita PHP Lua Ruby Perl
tina Tcl/Tk Ruby Java
uva MySQL Perl Java PHP
xena Java Perl PHP Lua XML
yollanda Ruby MySQL Tcl/Tk
zoe Ruby Lua Perl PHP
zachary MySQL Java Tcl/Tk
The 52 world is like a squashed melon 52 times
Dorothy:rn grahamellis$

=end