#
# edit commands
#
def edit
  system "vi ~/.temp.rb"
end

def new
  system "rm ~/.temp.rb; vi ~/.temp.rb"
end

def vi(arg)
  system "vi #{arg}"
end

#
# run commands
#
def run(*args)
  system "ruby ~/.temp.rb #{args.to_s}"
end

def ruby(arg)
  system "ruby #{arg}"
end

#
# directory commands
#
def ls(*args)
  system "ls #{args.to_s}"
end

def pwd
  Dir::pwd
end

def cd(arg)
  Dir::chdir(arg)
end

def mkdir(arg)
  Dir::mkdir(arg)
end

#
# file commnads
#
def cat(arg)
  system "cat #{arg}"
end

def less(arg)
  system "less #{arg}"
end

def cp(arg)
  system "cp #{arg}"
end

def mv(arg)
  system "mv #{arg}"
end

def rm(arg)
  system "rm #{arg}"
end