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https://stackoverflow.com/questions/17140886/how-to-search-and-replace-text-in-a-fileUse
sed '/#start/,/#end/replace_command'
For example, if the file is called myconfig, and you want to replace "allow" with "deny" in that section, you could say
sed '/#start/,/#end/s/allow/deny/' myconfig
example
sed -i -r "/<elasticConfig>/,/<\/elasticConfig>/s,<enabled>.+</enabled>,<enabled>false</enabled>," file.xml
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https://unix.stackexchange.com/questions/272061/bash-sh-script-to-replace-text-between-some-tags-strings-in-a-text-file