trim

#!/usr/bin/env ruby
# Author: Joseph Pecoraro
# Date: Saturday April 4, 2009
# Description: Opposite of Head.
# Removes the first -n lines.

#
# You can use `line` instead.  Example:
# 
#  Before: trim -10 file.txt
#  After:  line 11* file.txt
#

# Line to trim up to
limit = 0

# Get a Command line Limit
ARGV.each do |arg|
	if matches = arg.match( /^-(\d+)$/ )
		limit = matches[1].to_i
	end
end

# Remove Command Line Args
ARGV.delete_if { |arg| arg.match(/^-\d+$/) }

# Print Lines from STDIN
if ARGV.size == 0
	
	# Skip Lines
	while limit > 0
		limit -= 1
		gets
	end
	
	# Print Loop
	while ( line = gets )
		puts line
	end
		
# Print Lines from a File
else

	ARGV.each do |filename|
		lines = File.readlines(filename)
		lines.slice!(0, limit)
		lines.each { |l| puts l }
	end
	
end