This article will show you how to generate a CSR request and get it signed on a linux CA (CentOS/Red Hat). Follow this link if you have not already installed and configured CA server. We can run the below command to generate the CSR (Certificate Signing Request).

# mkdir /tmp/certs
# openssl req -new -nodes -sha256 -out certificate_request.csr -newkey rsa:2048 -keyout /tmp/certs/certificate_key.key -extensions v3_req

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SED is a very powerful utility which allows find and replace/insert text functionality. It should be used with Caution and is recommended to use dry-run before committing the changes. Below are the various commands for text manipulation.

Note: \n = for newline and \t = for TAB space and For dry run just remove "-i" from the command

 Find the pattern and Insert text AFTER

# sed -i 's/.*search 1st Line.*/&\nInsert 2nd line/' file1

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