如何使用awk来提取引述场？ [英] How to use awk to extract a quoted field?

问题描述

我使用

awk '{ printf "%s", $3 }'

从空格分隔行提取一些领域。当然，我得到的部分结果时域里面的自由空间引用。可能任何机构提出一个解决方案吗？

to extract some field from a space delimited line. Of course I get partial results when the field is quoted with free spaces inside. May any body suggest a solution please?

推荐答案

这实际上是相当困难的。我想出了以下的手动和专卖店分割线的所有领域中的数组AWK 脚本。

This is actually quite difficult. I came up with the following awk script that splits the line manually and stores all fields in an array.

{
    s = $0
    i = 0
    split("", a)
    while ((m = match(s, /"[^"]*"/)) > 0) {
        # Add all unquoted fields before this field
        n = split(substr(s, 1, m - 1), t)
        for (j = 1; j <= n; j++)
            a[++i] = t[j]
        # Add this quoted field
        a[++i] = substr(s, RSTART + 1, RLENGTH - 2)
        s = substr(s, RSTART + RLENGTH)
        if (i >= 3) # We can stop once we have field 3
            break
    }
    # Process the remaining unquoted fields after the last quoted field
    n = split(s, t)
    for (j = 1; j <= n; j++)
        a[++i] = t[j]
    print a[3]
}

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