审计bash RPG的bash命令 [英] Audit bash commands for bash RPG

问题描述

我想能够编写一个程序，当你输入命令时，它会做一些事情，例如你使用 cd 的次数。类似这样的：

  [：〜$] cd public_html 
恭喜！你已经获得了徽章的高手！升级！ 
  

我所有的C ++文件到目前为止是：

  #include< iostream> 
 
 int main（int argc，char * argv []）{
 int counter = 0; 
 for（int i = 1; i  std :: cout< argv [i]<< std :: endl; 
 if（argv [i] ==cd）
 std :: cout<< 徽章赚cd高手！+ 5120经验值< std :: endl; 
} 
 return 0; 
} 
  

由于它反映了一个尝试的解决方案：

 ＃！/ bin / sh 
 bash | tee ./main 
  

和

  bind'RETURN：echo $（!!）| tee〜/ .main \\\
'
  

我决定使用

  export PROMPT_COMMAND ='history | tail -n1'
  

但这将意味着必须解析输出。

完成此操作最简单的方法是什么？

这是我设法产生的：

 ＃！/ bin / sh 
 export COUNTER = 0 
 export MAXWIDTH = 10 
 export TNL = 1000 
 update_prompt（）{
 export PS1 =>
} 
 cd（）{
 COUNTER = $（（$ COUNTER + 25））; 
 echo +25; 
 builtin cd $ @; 
} 
 help（）{
 echocustom commands are：score; 
} 
 score（）{
 echo $ COUNTER/$ TNL 
 BAR = $（yes＃| head -n 10 | tr -d'\\\
 '）
 OVERLAY = $（yes％| head -n 10 | tr -d'\\\
'）
 WIDTH = $（echo$ COUNTER * $ MAXWIDTH / $ TNL| bc ）
 FIRST = $ {BAR：0：WIDTH} 
 SECOND = $ {OVERLAY：0：$（（MAXWIDTH-WIDTH））} 
 echo[$ FIRST $ SECOND] 
} 
 exit（）{
 echoBye bye; 
 builtin exit $ @; 
} 
 export -f update_prompt 
 export -f cd＃export函数
 export -f help 
 export -f score 
 export -f exit 
 
 bash＃run带有导出函数的subshel​​l 
 update_prompt 
  

解决方案

一个简单的解决方案是在shell中覆盖你的shell的 cd 命令。例如，在Bash或ZSH中：

  cd（）{
 echoCongratulations 
 builtin cd $ @; 
} 
  

（例如用于 autoenv 。）

您可以对所有其他命令执行相同操作。你也可以从那里调用你的C ++代码。

如果你想把它放入脚本，例如。 name it learn-bash.sh ：

  ..} 
 export -f cd＃导出函数
 
 bash＃运行带有导出函数的subshel​​l 
  

---

另一个解决方案，你有更多的力量，但是更多的涉及：获取Bash的源代码（它的C）它（由C或C ++）。然后你可以基本上做任何你想要的。你有一切直接在那里，即解析的命令等。

I want to be able to write a program that when you type in commands, it will do things like count the amount of times you've used cd. Something similar to this:

[ : ~ $] cd public_html
Congratulations! You've earned the Badge 'cd master!'. Level up!

All my C++ file consists of so far is:

#include <iostream>

int main(int argc, char* argv[]) {
    int counter = 0;
    for (int i = 1; i < argc; i++) {
        std::cout << argv[i] << std::endl;
        if (argv[i] == "cd")
            std::cout << "Badge earned 'cd master!' +5120 experience points" << std::endl;
    }
    return 0;
}

As it reflects one attempted solution involving:

#!/bin/sh
bash | tee ./main

and

bind 'RETURN: "echo $(!!) | tee ~/.main \n"'

I've decided to go with

export PROMPT_COMMAND='history | tail -n1'

But that would mean having to parse the output.

What's the easiest way of accomplishing this?

edit

Here's what I've managed to produce:

#!/bin/sh
export COUNTER=0
export MAXWIDTH=10
export TNL=1000
update_prompt() {
  export PS1="> "
}
cd() {
  COUNTER=$(($COUNTER + 25));
  echo +25;
  builtin cd $@;
}
help() {
  echo "custom commands are: score";
}
score() {
  echo $COUNTER"/"$TNL
  BAR=$(yes "#" | head -n 10 | tr -d '\n')
  OVERLAY=$(yes "%" | head -n 10 | tr -d '\n')
  WIDTH=$(echo "$COUNTER*$MAXWIDTH/$TNL" | bc)
  FIRST=${BAR:0:WIDTH}
  SECOND=${OVERLAY:0:$((MAXWIDTH-WIDTH))}
  echo "["$FIRST$SECOND"]"
}
exit() {
    echo "Bye bye";
    builtin exit $@;
}
export -f update_prompt
export -f cd # export the function
export -f help
export -f score
export -f exit

bash # run subshell with the exported functions
update_prompt

解决方案

An easy solution is to overwrite the cd command of your shell inside the shell itself. For example, in Bash or ZSH:

cd() {
  echo "Congratulations";
  builtin cd $@;
}

(This is for example used in projects like autoenv.)

You can do the same for all other commands. You can also call your C++ code from there.

If you want to put that into a script, e.g. name it learn-bash.sh:

cd() { ... }
export -f cd # export the function

bash # run subshell with the exported functions

---

Another solution, where you have much more power, but which is way more involved: take the source code of Bash (it's C) and extend it (by C or C++). Then you can basically do whatever you want. And you have everything directly there, i.e. the parsed commands, etc.

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