如何从 html table in bash 的列中读取整数

Question

我有一个 html table:

<table>
  <tr><td colspan=2>"some text"</td><td>"last week"</td><td>"current week"</td><td>"Delta"</td></tr>
  <tr><td>"some text"</td><td>"some text"</td><td>integer</td><td>integer</td><td>integer</td></tr>
  <tr><td>"some text"</td><td>"some text"</td><td>integer</td><td>integer</td><td>integer</td></tr>
  <tr><td>"some text"</td><td>"some text"</td><td>integer</td><td>integer</td><td>integer</td></tr>
  <tr><td>"some text"</td><td>"some text"</td><td>integer</td><td>integer</td><td>integer</td></tr>
</table>

我想从 "current week" 列中提取每个整数，所以从每一行中提取第二个整数（没有第一行 - header 行）。

Answer 1

Perl 来拯救：有 HTML::TableExtract

#!/usr/bin/perl
use warnings;
use strict;

use HTML::TableExtract;

my $te = 'HTML::TableExtract'->new( headers => [ 'current' ] );
$te->parse('<table>...</table>');
my $tab = ($te->tables)[0];
for my $row ($tab->rows) {
    print $row->[0], "\n";
}

Answer 2

使用xmllint and xpath：

输入HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body>
        <table> <tr>
                <td colspan="2">"some text"</td>
                <td>"last week"</td>
                <td>"current week"</td>
                <td>"Delta"</td>
            </tr> <tr>
                <td>"some text"</td>
                <td>"some text"</td>
                <td>1</td>
                <td>2</td>
                <td>3</td>
            </tr> <tr>
                <td>"some text"</td>
                <td>"some text"</td>
                <td>integer</td>
                <td>integer</td>
                <td>integer</td>
            </tr> <tr>
                <td>"some text"</td>
                <td>"some text"</td>
                <td>integer</td>
                <td>integer</td>
                <td>integer</td>
            </tr> <tr>
                <td>"some text"</td>
                <td>"some text"</td>
                <td>integer</td>
                <td>integer</td>
                <td>integer</td>
            </tr> </table>
    </body></html>

xmllint :

$ xmllint --html --xpath "//td[text()='\"current week\"']/following::td[4]/text()" file_or_URL

或将 xpath 与数字位置（1 到 ...）一起使用：简单地：

$ xmllint --html --xpath "//tr[2]/td[4]/text()" file_or_URL

如何从 html table in bash 的列中读取整数

How to read integers from a column of an html table in bash

bash

输入HTML

xmllint :

输出：