CODEWITHSUNDEEP
bash
DylanDylanDylanDylanAndDylan
DylanDylanDylanDylanAndDylan

Reputation: 43

How to remove lines that begin with the same character?

I'm trying to clean up the output from someone else's script by removing the headers that have no content.

Output currently looks like this:

====== Header1 ======
====== Header2 ======
====== Header3 ======
information

I'm trying to remove the lines for Header1 and Header2, but not Header3. I found an awk command that removes all duplicate lines but the last that begin with the same character, so that helps for this issue, but causes a new problem when the 'information' bit is numerous lines that also begin with the same character (usually tabs).

Desired output post cleanup:

====== Header3 ======
information

Thanks

Upvotes: 2

Views: 75

Answers (1)

user000001
user000001

Reputation: 33327

This awk might work for you:

$ awk '/^===/{h=$0;p=0;next}!p{print h};{p=1}1' file
====== Header3 ======
information

Or as Glenn pointed out, this also works:

awk '/^===/{h=$0;next}h{print h;h=0}1' file

Upvotes: 1

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