如何在bash中用一个循环处理多级结果？

Question

我需要创建一个特定的循环，该循环将在一定程度上描述具有所有节点的网络。这个循环将是与主题无关的其他内容的一部分。如您所知，在网络中，一个节点连接到另一个节点，依此类推。我将所有这些节点放在单独的文件中，我需要用一个循环来处理它们。每个循环都会产生更多的结果，我需要在其中执行更多的循环，并且数量呈指数增长，直到达到断点。现在我知道如何用 50 个嵌套循环来解决这个问题了：

declare loopvarnode=($(some command to get list of nodes))
for a in ${loopvarnode[@]}
        do
        declare check1=($(grep ${a[@]} results.file))
        if [[ "$a" == "breaking point" ]]
        then echo "Match found"; break
        elif [[ ! $check1 -z ]]
        then continue
        fi
        echo ${a[@]} >> results.file
        declare loopvarnode1=($(same thing but now we look for results in what was provided by variable $a))
        for b in ${loopvarnode1[@]}
            do
            declare check2=($(grep ${b[@]} results.file))
            if [[ "$b" == "breaking point" ]]
            then echo "Match found"; break
            elif [[ ! $check1 -z ]]
            then continue
            fi
            echo ${b[@]} >> results.file
            declare loopvarnode2=($(same thing but now we look for results in what was provided by variable $b))
            for c in ${loopvarnode2[@]}
                do 
.....

在大约 50 个之后，我想我应该没问题，但也许有一种方法可以通过一个或两个循环正确地做到这一点。

Answer 1

您可以使用递归函数而不是复制粘贴相同的循环：

 // is first list parameter. 
    function do_things {    
      for a in ${[@]}
      do
        declare check1=($(grep ${a[@]} results.file))
        if [[ "$a" == "breaking point" ]]
        then echo "Match found"; break
        elif [[ ! $check1 -z ]]
        then continue
        fi
        echo ${a[@]} >> results.file
        declare loopvarnode1=($(same thing but now we look for results in what was provided by variable $a))
        do_things loopvarnode1
      done

}

类似的东西。

Answer 2

另外，为了更正您的函数，将数组作为参数传递将无法直接工作（我得到了错误的替换）。它是这样工作的：

function do_things {
    array=( "$@" )
  for a in ${array[@]}
  do
    declare check1=($(grep ${a[@]} results.file))
    if [[ "$a" == "breaking point" ]];
    then echo "Match found"; break
    elif [[ ! -z $check1 ]];
    then continue
    fi
    echo ${a[@]}
    x=$(( $x + 1 ))
    declare loopvarnode1=($(some stuff with $a))
    do_things ${loopvarnode1[@]}
  done }

如何在bash中用一个循环处理多级结果？

How to process multiple levels of results with a single loop in bash?

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nested-loops