难以理解AWK语法 [英] Difficulty understanding AWK syntax

问题描述

因此，我承认我对AWK完全陌生，不知道如何使用它，但是我正在尝试根据GNU awk用户指南编写代码示例.

So I will admit I am completely new to AWK and have no idea how to use it, however I am trying to work off a code sample from the GNU awk user guide.

{
    for (i = 1; i <= NF; i++)
        freq[$i]++
}

END {
    for (word in freq)
        printf "%s\t%d\n", word, freq[word]
}

此代码段仅显示频率中存在的每个单词的计数

This code snippet simply prints the count of every word present in the in freq

    {
    data[++data_index] = $0
    }

END {
    produce_numbers(data)
    for(i in freq)
        printf("%s\t%d", i, freq[i])
}

function produce_numbers(sortedarray)
{
    n = asort(sortedarray)
    sum = 0

    for(i = 1; i <= n; i++)
    {
        freq[$i]++
    }

    return
}

这是我要使用的.我确信它有几个错误(显然是因为我的任何输出是错误的或不存在的)，但是我对语法的了解不足.另外，我要传递的文件是这样的

This is one I am trying to use. I am sure it has several mistakes (Obviously because any output I have is wrong or nonexistant) but I am not experienced enough to know the syntax. Also the file I am trying to pass is something like this

A
B
A
C
B
A
C
D

推荐答案

我重新组织并修复了该问题:

I reorganized and fixed that:

function produce_numbers(sortedarray)
{
    n = asort(sortedarray)
    # sum = 0                          # not used

    for(i = 1; i <= n; i++)
    {
        freq[sortedarray[i]]++         # $i is unusable at this point
    }
    return
}
{
    data[++data_index] = $0
}
END {
    produce_numbers(data)
    for(i in freq)
        printf("%s\t%d\n", i, freq[i])  # added newline to output
}

输出:

A       3
B       2
C       2
D       1

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