kp - kill multipy process at once

#!/usr/bin/env ruby
require "optparse"

#store options in hash
options = {}
opt_parse = OptionParser.new do |opts|
  opts.banner = 'kp: kill multi process with keywords.'
  opts.separator  ""
  opts.separator  "Options"

  # This displays the help screen, all programs are
  # assumed to have this option.
  opts.on('-h', '--help', 'display this usage page') do
    puts opts; exit
  end
 
  opts.on('-k keywords', '--keywords keywords', Array, 'key words of process name, eg: [A,B].') do |value|
    options[:keywords] = value
  end

  opts.separator  ""
  opts.separator  "Commands"
  opts.separator  "     kp -k resque"
  opts.separator  "     kp -k resque,redis"
end

begin
  opt_parse.parse!
rescue => e
  puts opt_parse;  exit
end
#show usage page when optins[:keywords] empty
if options[:keywords].nil?
  puts opt_parse;  exit
end

puts "kill process with keywords:" + options[:keywords].join(",")
keywords = options[:keywords].push("PID").join("|")

# execute shell command
# return [status, *ret]
def shell_cmd(cmd)
  IO.popen(cmd) do |stdout|
    stdout.reject(&:empty?)
  end.unshift($?.exitstatus.zero?)
end

# shell command string
cmd = "ps aux | grep -E '#{keywords}' | grep -v 'grep' | grep -v '#{Process.pid}'"
status, *result = shell_cmd(cmd)

# execute error or result is empty
if !status or result.size == 1
  puts "shell command below:"
  puts cmd
  puts (!status ? "execute error:" : "result is empty:")
  puts result.join("\n")
  exit
end

# display result
result.each_with_index do |row, index|
  puts (index.zero? ? "INDEX" : index).to_s.ljust(7, " ") + row
end

# transpose
title = result[0].split
result = result.map(&:split).map do |row|
  row.first(title.size-1).push(row.last(row.size-title.size+1).join(" "))
end

puts "type the index you kill (spareat by white space):\r"
input = STDIN.gets.strip.split

pid_index =  title.index("PID")
cmd_index =  title.index("COMMAND")

puts "kp result:"
result.each_with_index do |row, index|
  tmp = row.values_at(pid_index, cmd_index)
  printf("%-10s %-10s %-10s\n", *tmp.unshift("STATUS")) if index.zero?

  #grep type index
  if input.include?(index.to_s)
    status, *ret = shell_cmd("kill -9 #{tmp[0]}")
    printf("%-10s %-10s %-10s\n", *tmp.unshift(status ? "killed" : "FAIL"))
  end
end