Convert to upper or lower case in shell

convert string to upper or lower case in shell script

convert string to upper case
echo aBcD | tr '[:lower:]' '[:upper:]'

convert string to lower case
echo aBcD | tr '[:upper:]' '[:lower:]'

Create pem certificate

 Creating a .pem with the Private Key and Entire Trust Chain     Log into your DigiCert Management Console and download your Intermediate (D...

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