Print odd-numbered lines, print even-numbered lines

I prefer to be POSIX compatible, whenever possible, so I thought I'd post this alternative method. I often use these to mangle text, before xargs pipelines.

Print Even Numbered Lines,

sed -n 'n;p'

Print Odd Numbered Lines,

sed -n 'p;n'

Although I often use awk, it's overkill for this type of task.

That's easy:

 sed -n 2~2p filename

will print even-numbered lines from filename

sed -n 1~2p filename

will print odd-numbered lines.

For even numbers the code should be

awk 'NR%2==0' filename

& for odd numbers

awk 'NR%2==1' filename