无法shell脚本的内部时，命令执行

Question

所以今天晚上的大部分时间通过RVM永久影响Linux环境中活跃的Ruby版本，我一直在努力用bash脚本我写，以帮助简化/自动化/引导（无论你想调用它）我的开发环境，从头开始创建一个新的Rails项目。

我正在模块化编写脚本，即编写完全自己的脚本，这些脚本独立于较大的整体脚本运行，然后将其整合到脚本流程中。

我与之战斗的当前scriptlet与交互式更改活动Ruby版本有关，如果您想要安装的版本已经存在，并且如果您想要的版本不存在，它将安装并设置为活动版本。

这主要是一个增强整个过程，而不是在所有的脚本本身重要，但一个非常大的“锦上添花”，

至于是什么，我在准备写作已经完成此功能：

1. 设置我的终端接受壳登录（Linux Mint的17.1）
2. 添加源$ HOME/.rvm /脚本/ RVM使RVM为脚本中的函数运行

首先，我将粘贴代码测试的输出日志，然后粘贴脚本代码本身。注意：$ crver只是我创建的一个环境变量，它指向可执行脚本以节省输入时间。

安装Ruby的新版本：

[email protected] ~ $ $crver 

rvm rubies 

=* ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

Is the version of Ruby you wish to use listed above? (Y/N) n 
Enter the Ruby version to install (ex: 2.2.2), followed by [ENTER]: 2.2.1 
Searching for binary rubies, this might take some time. 
No binary rubies available for: mint/17.1/x86_64/ruby-2.2.1. 
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies. 
Checking requirements for mint. 
Requirements installation successful. 
Installing Ruby from source to: /home/gabrial/.rvm/rubies/ruby-2.2.1, this may take a while depending on your cpu(s)... 
ruby-2.2.1 - #downloading ruby-2.2.1, this may take a while depending on your connection... 
ruby-2.2.1 - #extracting ruby-2.2.1 to /home/gabrial/.rvm/src/ruby-2.2.1.... 
ruby-2.2.1 - #applying patch /home/gabrial/.rvm/patches/ruby/2.2.1/fix_installing_bundled_gems.patch. 
ruby-2.2.1 - #configuring......................................................... 
ruby-2.2.1 - #post-configuration.. 
ruby-2.2.1 - #compiling............................................................................... 
ruby-2.2.1 - #installing............................. 
ruby-2.2.1 - #making binaries executable.. 
ruby-2.2.1 - #downloading rubygems-2.4.6 
ruby-2.2.1 - #extracting rubygems-2.4.6..... 
ruby-2.2.1 - #removing old rubygems......... 
ruby-2.2.1 - #installing rubygems-2.4.6..................... 
ruby-2.2.1 - #gemset created /home/gabrial/.rvm/gems/[email protected] 
ruby-2.2.1 - #importing gemset /home/gabrial/.rvm/gemsets/global.gems............................................... 
ruby-2.2.1 - #generating global wrappers........ 
ruby-2.2.1 - #gemset created /home/gabrial/.rvm/gems/ruby-2.2.1 
ruby-2.2.1 - #importing gemsetfile /home/gabrial/.rvm/gemsets/default.gems evaluated to empty gem list 
ruby-2.2.1 - #generating default wrappers........ 
ruby-2.2.1 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake). 
Install of ruby-2.2.1 - #complete 
Ruby was built without documentation, to build it run: rvm docs generate-ri 
Using /home/gabrial/.rvm/gems/ruby-2.2.1 
[email protected] ~ $ rvm list 

rvm rubies 

    ruby-2.2.1 [ x86_64 ] 
=* ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

使用Ruby的预先存在的版本，并将其设置为活动：

[email protected] ~ $ $crver 

rvm rubies 

    ruby-2.2.1 [ x86_64 ] 
=* ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

Is the version of Ruby you wish to use listed above? (Y/N) y 
Enter the Ruby version to use (ex: 2.2.2), followed by [ENTER]: 2.2.1 
Using /home/gabrial/.rvm/gems/ruby-2.2.1 
[email protected] ~ $ rvm list 

rvm rubies 

    ruby-2.2.1 [ x86_64 ] 
=* ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

正如你所看到的，在脚本它验证它将Ruby的版本设置为2.2.1，但在实际环境中，它仍然为2.2.2

奇怪的是，我也尝试使用rvm use $rubyver --default取得部分成功。当直接在命令行中运行的rvm list，它显示了默认版本预期的符号，但红宝石的活动版本保持不变：

[email protected] ~ $ $crver 

rvm rubies 

    ruby-2.2.1 [ x86_64 ] 
=* ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

Is the version of Ruby you wish to use listed above? (Y/N) y 
Enter the Ruby version to use (ex: 2.2.2), followed by [ENTER]: 2.2.1 
Using /home/gabrial/.rvm/gems/ruby-2.2.1 
[email protected] ~ $ rvm list 

rvm rubies 

* ruby-2.2.1 [ x86_64 ] 
=> ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

下面是脚本本身的代码块：

#!/bin/bash 
source $HOME/.rvm/scripts/rvm 

rvmexec() { 
    msg="Enter the Ruby version to $1 (ex: 2.2.2), followed by [ENTER]: " 
    case $1 in 
     [use]*) 
      read -p "$msg" rubyver 
      eval rvm use $rubyver 
      unset rubyver; 
      break;; 
     [install]*) 
      read -p "$msg" rubyver 
      eval rvm install $rubyver && rvm use $rubyver 
      unset rubyver; 
      break;; 
    esac 
} 

rvm list 
    while true; do 
     read -p "Is the version of Ruby you wish to use listed above? (Y/N) " rubyverexist 
     case $rubyverexist in 
      [Yy]*) rvmexec use; break;; 
      [Nn]*) rvmexec install; break;; 
      *) echo -e "\nERROR: Please enter a valid response\n";; 
     esac 
    done 

任何帮助，将不胜感激，请原谅我提前如果我留下什么东西出来的关键，这是上午01时13分和下班6点:)

干杯！

Answer 1

好了，一套新的眼睛和谷歌搜索后，它变成了所有我所要做的就是与source前言VAR（也就是现在的别名），然后脚本的行为与预期：

From ~/.profile: 
alias crver="source $HOME/workspace/crver.sh" 

--- Output Begins --- 

[email protected] ~ $ rvm list 

rvm rubies 

    ruby-2.2.1 [ x86_64 ] 
=* ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

[email protected] ~ $ crver 

rvm rubies 

    ruby-2.2.1 [ x86_64 ] 
=* ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

Is the version of Ruby you wish to use listed above? (Y/N) y 
Enter the Ruby version to use (ex: 2.2.2), followed by [ENTER]: 2.2.1 
Using /home/gabrial/.rvm/gems/ruby-2.2.1 
[email protected] ~ $ rvm list 

rvm rubies 

=* ruby-2.2.1 [ x86_64 ] 
    ruby-2.2.2 [ x86_64 ] 

# => - current 
# =* - current && default 
# * - default 

耶！

〜翅