FAQ : How to use grep command to remove blank lines from file
Answer: To remove the blank lines from file, use the given below syntax

grep -v '^$' /path/of/file-name

In above command,

-v = Invert the sense of matching, to select non-matching lines
^$ = It is regex. ^ means start with and $ means end with. Combining both ^$ means blank lines

Example (With screenshot):

In below given file, contents have some lines in between

Now using grep command to remove blank line from file.

Learn more about grep command in our blog. Click Here.