Ruby的什么是Python的sys.可执行版本?

In Python, you can do

在Python中，您可以这样做

>>> import sys
>>> sys.executable
'/usr/bin/python'

to get at the executable's location. Can you do the same thing just using something built-in to Ruby? It can be a special variable, method, etc.

获取可执行文件的位置。你能用Ruby内置的东西做同样的事情吗?它可以是一个特殊的变量、方法等。

If there isn't, what is the cleanest, most reliable way of determining the ruby executable's location in a cross-platform way?

如果没有，用跨平台的方式确定ruby可执行文件的位置的最干净、最可靠的方法是什么?

Related:

5 个解决方案

#1

Run this in IRB:

在IRB运行这个:

require 'rbconfig'

key_length = RbConfig::CONFIG.keys.max{ |a,b| a.length <=> b.length }.length
RbConfig::CONFIG.keys.sort_by{ |a| a.downcase }.each { |k| puts "%*s => %s" % [key_length, k, RbConfig::CONFIG[k]] }

It will output an "awesome print" style list of all the Ruby configuration info.

它将输出所有Ruby配置信息的“很棒的打印”样式列表。

   ALLOCA => 
       AR => ar
     arch => x86_64-darwin10.5.0
ARCH_FLAG => 
  archdir => /Users/greg/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/x86_64-darwin10.5.0
 ARCHFILE => 
       AS => as
  ASFLAGS => 
 BASERUBY => ruby
   bindir => /Users/greg/.rvm/rubies/ruby-1.9.2-p0/bin

bindir is the path to the currently running Ruby interpreter. Above it in the list is BASERUBY => ruby.

bindir是当前运行的Ruby解释器的路径。在列表的上面是BASERUBY => ruby。

RbConfig::CONFIG.values_at('bindir', 'BASERUBY').join('/')
=> "/Users/greg/.rvm/rubies/ruby-1.9.2-p0/bin/ruby"

Checking my work:

检查我的工作,

greg-mbp-wireless:~ greg$ which ruby
/Users/greg/.rvm/rubies/ruby-1.9.2-p0/bin/ruby

There's a lot more information than this so it's worth running the code I added above to see what's available.

这里有更多的信息，所以运行我上面添加的代码看看有什么可用的。

#2

Linux-based systems are OK with

基于linux的系统可以接受

`whereis ruby`.split(" ")[1]

It will call whereis ruby and parse its' output for the second entry (first contains 'whereis:')

它将调用whereis ruby并解析它的“第二个条目的输出”(首先包含“whereis:”)

The more strict method is to call

更严格的方法是调用。

puts `ls -al /proc/#{$$}/exe`.split(" ")[-1]

It will get the executable name for the current process (there is $$ variable and Process.pid method to obtain that) from /proc/pid/exe symlink information.

它将获得当前进程的可执行名称(有$$变量和进程。pid方法获取)从/proc/pid/exe符号链接信息。

#3

Works in a script, not from irb:

在剧本中工作，不是来自irb:

puts open($PROGRAM_NAME).readline.gsub /#! *([^ ]+).*/, '\1'

;-)

:-)

#4

It looks like the answer is in RbConfig::CONFIG I think RbConfig::CONFIG['bindir'] provides the directory where the executable is located, the rest is s (or should be) straight forward.

看起来答案在RbConfig::CONFIG中，我想是RbConfig: CONFIG['bindir']提供了可执行文件所在的目录，其余的是s(或应该是)。

RbConfig::CONFIG['bindir']+'/ruby' should work, even in windows as the exe can be ommitted

配置['bindir']+'/ruby'应该可以工作，即使是在windows中，因为exe可以省略

#5

Looks like the only truly reliable way is

看起来唯一真正可靠的方法是

 system("#{Gem.ruby} another_file.rb")

This works even for odd cases like jruby being run as a jar, etc.

这甚至适用于像jruby作为jar运行的情况，等等。

Also see

也看到

 OS.ruby_bin

https://github.com/rdp/os

#1