Extract an XML element value in shell script

Question

I have something like below in my sample.xml file, and want to extract the value which is in version tag only when the artifactId is app1 as we would be having the multiple same set of tags with different artifactId in the given file using shell script.

<groupId>abc.app1</groupId>
<artifactId>app1</artifactId>
<packaging>pom</packaging>
<name>app1 ${version}</name>
<version>1.2.50</version>

My final output would be like below,

variable1=1.2.50

Note that I need to read a file and extract that string.

only when the artifactId is app1 as we would be having the multiple same set of tags so write code for that. You can use Python or Perl xml modules, there is xmllint and xmlstarlet. Shell has no XML support. — KamilCuk
– KamilCuk, Commented Feb 22, 2022 at 15:05

KamilCuk · Accepted Answer · 2022-02-22 15:03:27Z

2

For parsing xml files use xml parsers.

xmllint --xpath 'string(//version)' -

answered Feb 22, 2022 at 15:03

KamilCuk

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Daniel Haley Over a year ago

Or perhaps //*[artifactId="app1"]/version since the requirement was only when the artifactId is app1.

Gaétan RYCKEBOER · Accepted Answer · 2022-02-22 14:30:30Z

0

Be carefull of XML pattern extract. It may become odd if the pattern is a hierarchy, and you may have to use XML dedicated libraries.

But, in your example, you may use a combination of grep and cut to extract your pattern:

cat $file | egrep '<version>' \
| cut '> -f 2 | cut '<' -f 1

answered Feb 22, 2022 at 14:30

Gaétan RYCKEBOER

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2 Comments

Gaétan RYCKEBOER Over a year ago

The whole code (the fishing rod, the mealworm and even the fish) : version=$( cat $file | egrep ''<version>' | cut '> -f 2 | cut '<' -f 1 | tail -n 1 ) ; echo "version=${version}" Do not forget the "tail", to ensure you only have one result, the first one, in case of multiple values (standard failure case that may be catastrophic in some situations)

PS83 Over a year ago

Thanks @Gaetan, I tried the above as script file and getting given error. #!/bin/bash file=/tmp/path/my.xml echo $file version=$( cat $file | egrep ''<version>' | cut '> -f 2 | cut '<' -f 1 | tail -n 1 ) ; echo "version=${version}" However this is failing with below error. /tmp/path/my.xml ./test1.sh: line 4: version: No such file or directory cut: '<': No such file or directory version=

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