使用 awk 循环输入字符串中的字符 [英] loop over characters in input string using awk

问题描述

信不信由你，我找不到这个非常基本的问题的答案.

Believe it or not, I can't find the answer to what I would think would be this very basic question.

在 awk 中，如何逐个字符地循环输入字符串?假设我只是想把它们打印出来.有我可以访问的数组吗?或者我需要使用 substr 吗?

In awk, how can I loop over the input string character by character? Let's say I just wanted to print them out. Is there an array I can access? Or do I need to use substr?

基本上，类似于:

echo "here is a string" | awk '
{ for(i=0; i<[length of input string]; i++) 
    printf [value at index i in array x]; 
}'

坦率地说，我很尴尬.

推荐答案

您可以使用 split 将字符串转换为数组:

You can convert a string to an array using split:

echo "here is a string" | awk '
{ 
  split($0, chars, "")
  for (i=1; i <= length($0); i++) {
    printf("%s
", chars[i])
  }
}'

这会垂直打印字符，每行一个.

This prints the characters vertically, one per line.

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