How to switch/rotate every two lines with sed/awk?

Question

I have been doing this by hand and I just can\'t do it anymore-- I have thousands of lines and I think this is a job for sed or awk.

Essentially, we have a file lik

Answer 1

First question:

awk '{x = $0; getline; print; print x}' filename

next question: sort by 2nd line

paste - - < filename | sort -f -t $'\t' -k 2 | tr '\t' '\n'

which outputs:

dobroye utro!
Good morning!
annyonghaseyo
hello
watashi
me