My script to upgrade Git

upgrade-git.rb

#!/usr/bin/env ruby -w
require 'fileutils'
include FileUtils

Version = ARGV.first
Downloads = File.join(ENV['HOME'], "Downloads")
BashCompletion = File.join(ENV['HOME'], ".bash_completion", "git_bash_completion")

# Create src download directory, if needed
mkdir_p(Downloads) unless File.exists?(Downloads)

# Download and extract the Git source tarball and documentation
cd(Downloads)  do
  `wget http://kernel.org/pub/software/scm/git/git-#{Version}.tar.gz`
  `tar xvzf git-#{Version}.tar.gz`
end

# Build and install Git
cd(File.join(Downloads, "git-#{Version}")) do
  `./configure --prefix=/usr/local && make && sudo make install`
end

# Install the man pages
cd(Downloads) do
  `wget http://www.kernel.org/pub/software/scm/git/git-manpages-#{Version}.tar.bz2`
  `sudo tar xjv -C /usr/share/man -f git-manpages-#{Version}.tar.bz2`
  `sudo periodic weekly`
end

# Update bash completion
cd(Downloads) do
  `cp contrib/completion/git-completion.bash #{BashCompletion}`
end