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:]'

Ubuntu Unsupported upgrades

 Unsupported upgrades Sometimes do-release-upgrade isn't able to run the upgrade to the latest version and it shows an error similar t...

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