How can I delete blank lines in a file?

Question

I've got a .txt file like this:

I want to get it like this:

I'm thinking I need to replace /(beginning of line)(new line character)/.

Also see [Please don't post images of text](http://meta.unix.stackexchange.com/questions/4086/psa-please-dont-post-images-of-text) — Zachary Brady, Aug 17 '16 at 01:52
Why are you trying to reopen the question without changing its contents, especially considering it already has an answer **and** it's a duplicate? — Julie Pelletier, Aug 17 '16 at 06:16
Maybe it got a reopen request because of a minor change you did to it. — Julie Pelletier, Aug 17 '16 at 18:30

score 3 · Accepted Answer · answered Aug 17 '16 at 01:52

Please don't post pictures of text; copy and paste from the terminal into the question.

There are several ways to filter out blank lines. Two of the simplest would be as follows.

With grep:

grep -v '^$' /path/to/input > /path/to/output

With sed:

sed '/^$/d' /path/to/input > /path/to/output
sed --in-place '/^$/d' /path/to/input # modify the file rather than creating a new one

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