在文件的开头收集标号 [英] Collect numerals at the beginning of the file

问题描述

我有一个包含一些数字的文本文件，例如，

I have a text file which contains some numerals, for example,

There are 60 nuts and 35 apples,
but only 24 pears.

我想在一开始收集这些数字（60，35，24）的相同文件，特别是，我想处理后，读取文件

I want to collect these numerals (60, 35, 24) at the beginning of the same file, in particular, I want after processing, the file to read

read "60"
read "35"
read "24"

There are 60 nuts and 35 apples,
but only 24 pears.

我怎么能这样做的文字操作可通行费的* nix这个使用一个？

How could I do this using one of the text manipulating tolls available in *nix?

推荐答案

您可以脚本的编辑会议上编辑一个文件：

You can script an ed session to edit the file in place:

{ 
  echo 0a    # insert text at the beginning of the file
  grep -o '[0-9]\+' nums.txt | sed 's/.*/read "&"/'
  echo ""
  echo .     # end insert mode
  echo w     # save
  echo q     # quit
} | ed nums.txt

更简洁：

printf "%s\n" 0a "$(grep -o '[0-9]\+' nums.txt|sed 's/.*/read "&"/')" "" . w q | ed nums.txt

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