BASH:如何对管道中的数字执行算术运算 [英] BASH: how to perform arithmetic on numbers in a pipe

问题描述

我正在管道中获得一连串数字，并且想要在将它们传递到下一部分之前执行一些操作，但是我对如何使用它而不破坏管道感到有些困惑. /p>

例如

> echo "1 2 3 4 5" | some command | cat 
1 4 9 16 25
>

您对如何制作类似作品有任何想法吗?我要执行的实际操作只是在每个数字上加一个.

解决方案

echo 1 2 3 4 5|{
  read line; 
  for i in $line;
  do
    echo -n "$((i * i)) "; 
  done; 
  echo
}

{}创建一个分组.您可以为此创建一个脚本.

I am getting a stream of numbers in a pipe, and would like to perform some operations before passing them on to the next section, but I'm a little lost about how I would go about it without breaking the pipe.

for example

> echo "1 2 3 4 5" | some command | cat 
1 4 9 16 25
>

Would you have any ideas on how to make something like this work? The actual operation I want to perform is simply adding one to every number.

解决方案

echo 1 2 3 4 5|{
  read line; 
  for i in $line;
  do
    echo -n "$((i * i)) "; 
  done; 
  echo
}

The {} creates a grouping. You could instead create a script for that.

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