HowTo: Remove Every Other Line in Text Files – Linux

Alex — Tue, 26 Apr 2011 23:38:57 +0000

Let’s say you’ve got a text file, of any size, big or small, and you want to remove every other line of that file, well here are a few commands in Linux that allow you to do this.

Example, you want to get from this:

1
2
3
4
5
6
7
8
9
10

To this:

1
3
5
7
9

The sed way:

sed -n "p;N;" file.txt > newfile.txt

The awk way:

awk ‘NR%2 != 0′ file.txt > newfile.txt

Here you can actually specify N lines, replace 2 in the above command and you’ll be able to take out every N’th number. As an example, here’s the above replaced with a 3 on the file:

1
2
4
5
7
8
10

Easy as pie, right?

Alex Sleat » remove every other line

HowTo: Remove Every Other Line in Text Files – Linux