脚本可用于文件输入,但不能用于标准输入

这真让我难堪。以下是我想做的:

我试着把一篇文章从 newsboat 写剧本。这个脚本应该从文章中提取标题和Url。

下面是一篇示例文章:

Feed: NYT > Home Page
Title: Hit Pause on Brett Kavanaugh
Author: THE EDITORIAL BOARD
Link: https://www.nytimes.com/2018/09/26/opinion/kavanaugh-supreme-court-hearing-delay.html?partner=rss&emc=rss
Date: Thu, 27 Sep 2018 01:58:11 +0200

The integrity of the Supreme Court is at stake.

这篇文章通过新闻船的一个宏进行了传播:

macro R pipe-to "cat | ~/.scripts/newsboat_extract"  

以下是工作脚本:

#!/bin/bash

cat > ~/newsboat         #I do not really need this file, so if I can cut out saving to a file, I would prefer to

title="$(awk -F: '/^Title:/{for(i=2;i<=NF;++i)print $i}' ~/newsboat)"
url="$(awk -F: '/^Link:/{print $2 ":" $3}' ~/newsboat)"
printf '%s\n' "$title" "$url" >> newsboat_result

Hit Pause on Brett Kavanaugh
https://www.nytimes.com/2018/09/26/opinion/kavanaugh-supreme-court-hearing-delay.html?partner=rss&emc=rss

我想避免保存到文件。然而,无论出于什么原因,保存到一个变量都不起作用:这是一个不起作用的脚本!

#!/bin/bash

article=$(cat)

title="$(awk -F: '/^Title:/{for(i=2;i<=NF;++i)print $i}' "$article")"
url="$(awk -F: '/^Link:/{print $2 ":" $3}' "$article")"
printf '%s\n' "$title" "$url" >> newsboat_result

输出变成:

#empty line
#empty line

有什么想法吗?-我对bash脚本和awk还很陌生,所以非常感谢大家对如何更有效地解决这个问题的评论。

"""""""""""" “解决方案” """"""""""""

成功了,谢谢!

#!/bin/bash

article=$(cat "${1:--}")

title="$(awk -F: '/^Title:/{for(i=2;i<=NF;++i)print $i}' <<< "$article")"
url="$(awk -F: '/^Link:/{print $2 ":" $3}' <<< "$article")"
printf '%s\n' "$title" "$url" >> newsboat_result