/usr/bin/restclient is in ruby-rest-client 1.6.7-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | #!/usr/bin/env ruby
$:.unshift File.dirname(__FILE__) + "/../lib"
require 'rubygems'
require 'restclient'
require 'yaml'
def usage(why = nil)
  puts "failed for reason: #{why}" if why
  puts "usage: restclient [get|put|post|delete] url|name [username] [password]"
  puts "  The verb is optional, if you leave it off you'll get an interactive shell."
  puts "  put and post both take the input body on stdin."
  exit(1)
end
POSSIBLE_VERBS = ['get', 'put', 'post', 'delete']
if POSSIBLE_VERBS.include? ARGV.first
  @verb = ARGV.shift
else
  @verb = nil
end
@url = ARGV.shift || 'http://localhost:4567'
config = YAML.load(File.read(ENV['HOME'] + "/.restclient")) rescue {}
@url, @username, @password = if c = config[@url]
  [c['url'], c['username'], c['password']]
else
  [@url, * ARGV]
end
usage("invalid url '#{@url}") unless @url =~ /^https?/
usage("too few args") unless ARGV.size < 3
def r
  @r ||= RestClient::Resource.new(@url, @username, @password)
end
r # force rc to load
if @verb
  begin
    if %w( put post ).include? @verb
      puts r.send(@verb, STDIN.read)
    else
      puts r.send(@verb)
    end
    exit 0
  rescue RestClient::Exception => e
    puts e.response.body if e.respond_to? :response
    raise
  end
end
POSSIBLE_VERBS.each do |m|
  eval <<-end_eval
def  #{m}(path, *args, &b)
	r[path].#{m}(*args, &b)
end
  end_eval
end
def method_missing(s, * args, & b)
  if POSSIBLE_VERBS.include? s
    begin
      r.send(s, *args, & b)
    rescue RestClient::RequestFailed => e
      print STDERR, e.response.body
      raise e
    end
  else
    super
  end
end
require 'irb'
require 'irb/completion'
if File.exists? ".irbrc"
  ENV['IRBRC'] = ".irbrc"
end
if File.exists?(File.expand_path(rcfile = "~/.restclientrc"))
  load(rcfile)
end
ARGV.clear
IRB.start
exit!
 |