How do I split up a line and rearrange its elements?

Question

I have some data on a single line like below

abc edf xyz rfg yeg udh

I want to present the data as below

abc
xyz
yeg


edf
rfg
udh

so that alternate fields are printed with newline separated. Are there any one liners for this?

Answer 1

The following awk script can do it:

> echo 'abc edf xyz rfg yeg udh' | awk '{
    for (i = 1;i<=NF;i+=2){print $i}
    print "";
    for (i = 2;i<=NF;i+=2){print $i}
    }'
abc
xyz
yeg

edf
rfg
udh