How to delete empty lines using sed command under Linux / UNIX

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Originally published at: https://www.cyberciti.biz/faq/using-sed-to-delete-empty-lines/

I need to delete all empty lines but could not figure out sed command for the same. How do I delete all empty lines with sed under Linux or Unix-like systems?

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Linux / Unix: Shell Remove Empty Lines
https://www.cyberciti.biz/faq/unix-linux-shell-remove-delete-empty-lines/