3 ways to remove blank lines from a file

There are certainly more than 3 ways to do this. Typically I’ve always used sed to do this, but here’s my method using sed and two other methods using tr and awk:

sed:

sed '/^$/d' file_with_blank_lines

tr:

tr -s '\n' <file_with_blank_lines

awk:

awk '{ if ($0) print $0 }' file_with_blank_lines

If you have other favorite ways, leave a note in the comments!