insert lines in text to get one word

perl -pi -e 's/ /\n/g' 01_Gen-words.txt

 remove blank lines
to delete empty lines:
	  
from line 633 to the end of the document:

    :633,$g/^$/d

the $ represents the end of the file, the ^$  represents a blank line, and the d - delete

do delete all empty lines, globally:

    :g/^$/d

and an alternate version:

    :v/./d


If you want to delete blank lines or those that contain spaces or tabs, use:

    :g/^\s*$/d

and an alternate version:

    :v/\S/d

   \S matches anything that is not a whitespace, and d deletes the flagged lines 
(all lines that have only whitespace characters or are blank).