Ruby code for opening a file and truncating and after, recording new data

file_1.rb

filename=ARGV.first
script=$0
puts "Data in the file named as #{filename} will be deleted"
puts "Press enter to continue"
print "? "
STDIN.gets
puts "Opening the file...."
target=File.open(filename,'w')
puts "Truncation the file"
target.truncate(target.to_s.size)
puts "Enter three lines to file"
print "name: ";name=STDIN.gets.chomp()
print "surname: ";surname=STDIN.gets.chomp()
print "number: ";number=STDIN.gets.chomp()
puts "your data will be written to file"
target.write(name)
target.write("\n")
target.write(surname)
target.write("\n")
target.write(number)
target.write("\n")
target.close()