Read and Modify the key value in XML using Bash/Shell script-CodePudding

I need to read (store in variable) and then change the online_hostname key value in XML using bash/shell script.

<?xml version="1.0" encoding="UTF-8" ?>
<bzinfo>
    <myidentity online_hostname="testdevice-air_2022_01_25" 
                bzlogin="[email protected]" />
</bzinfo>

I am able to read the value but not able to change it.

cat test.xml | grep '<myidentity ' | sed -E 's/.*online_hostname="?([^ "]*)"? .*/\1/'

Thanks

CodePudding user response：

It could be solved like this

sed -i 's@online_hostname=".*"@online_hostname="'"$MYVAR"'"@' test.xml

storing in

MYVAR="newhost"

using @ as separator -i as in-place of

CodePudding user response：

Here's an example with xmlstarlet:

Get the attribute value:

xmlstarlet sel -t -v '/bzinfo/myidentity/@online_hostname' test.xml

testdevice-air_2022_01_25

Update the attribute value:

xmlstarlet ed -u '/bzinfo/myidentity/@online_hostname' -v 'air&wired' test.xml

<?xml version="1.0" encoding="UTF-8"?>
<bzinfo>
  <myidentity online_hostname="air&amp;wired" bzlogin="[email protected]"/>
</bzinfo>

^{note: you can use the global option -L for inplace editing xmlstarlet ed -L -u ...}