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Insert text after the first occurance of searched string entry in a file


 
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# 1  
Old 10-30-2019
Insert text after the first occurance of searched string entry in a file

My server xml file has huge data part of which i'm sharing below.

Quote:
<!--
<Connector port="8443" protocol="org.apache.coyote.http11.Http11AprProtocol"
maxThreads="150" SSLEnabled="true" >
<UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
<SSLHostConfig>
<Certificate certificateKeyFile="conf/localhost-rsa-key.pem"
certificateFile="conf/local-rsa-cert.pem"
type="RSA" />
</SSLHostConfig>
</Connector>
-->

<!-- Define an AJP 1.3 Connector on port 8009 -->
......
......
I wish to add the below text held by variable "addthisline" after the closing braces i.e --> once the first </Connector> tag is found.
Code:
addthisline="I need to be inserted after the comments"

Thus my searchstring is "</Connector>" and i need keep looking for the next "-->" entry post which I need to add the line contained in $addthisline

This injection should happen only for the first instance of " </Connector>" string found in the file.

Expected Output:

Quote:
<!--
<Connector port="8443" protocol="org.apache.coyote.http11.Http11AprProtocol"
maxThreads="150" SSLEnabled="true" >
<UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
<SSLHostConfig>
<Certificate certificateKeyFile="conf/localhost-rsa-key.pem"
certificateFile="conf/local-rsa-cert.pem"
type="RSA" />
</SSLHostConfig>
</Connector>
-->

I need to be inserted after the comments

<!-- Define an AJP 1.3 Connector on port 8009 -->
......
......
Unfortunately, I just know how to add the text after the string is found using sed '/pattern/a some text here' filename

I'm using bash shell script on Redhat Linux 7.

Requesting suggestions.
# 2  
Old 10-30-2019
Difficult to achieve with sed as it can't keep the state of processing. This would insert the string after all occurrences:
Code:
sed -e "/<\/Connector/,/-->/{/-->/a $addthisline" -e'}' file

# 3  
Old 10-30-2019
Quote:
Originally Posted by RudiC
Difficult to achieve with sed as it can't keep the state of processing. This would insert the string after all occurrences:
Code:
sed -e "/<\/Connector/,/-->/{/-->/a $addthisline" -e'}' file

But, my requirement is to add only after the first occurance. A non sed solution will do.
# 4  
Old 10-30-2019
Try this awk code snippet, then:
Code:
awk -v"IT=${addthisline}" '/<\/Connector/,/-->/ {if (/-->/ && !L) {print; $0 = IT; L = 1}} 1' file


And, playing around with sed's hold space, I found this which might do as well:

Code:
sed -e "/<\/Connector/,/-->/{/-->/{x; s/XXX/&/; x; t; a $addthisline" -e'; x; s/.*/XXX/; x;} }' file


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