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处理xml的命令工具

2016-07-01 18:32 295 查看

down vote

XMLStarlet or another XPath engine is the correct tool for this job.

For instance, with

data.xml

containing
the following:

<root>
<item>
<title>15:54:57 - George:</title>
<description>Diane DeConn? You saw Diane DeConn!</description>
</item>
<item>
<title>15:55:17 - Jerry:</title>
<description>Something huh?</description>
</item>
</root>

...you can extract only the first title with the following:

xmlstarlet sel -t -m '//title[1]' -v . -n <data.xml

Trying to use sed for this job is troublesome. For instance, the regex-based approaches won't work
if the title has attributes; won't handle CDATA sections; won't correctly recognize namespace mappings; can't determine whether a portion of the XML documented is commented out; won't unescape attribute references (such as changing

Brewster
& Jobs

Brewster
& Jobs

), and so forth.

、、、、、、、、、、、、、、、、、、、、、、、、、、、、、

Do you really have to use only those tools? They're not designed for XML processing, and although it's possible to get something that works OK most of the time, it will fail on edge cases, like encoding,
line breaks, etc.

I recommend xml_grep:

xml_grep 'job' jobs.xml --text_only

Which gives the output:

programming

On ubuntu/debian, xml_grep is in the xml-twig-tools package.

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标签： xml

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