Insert lines from one text file to another one 

awk 'NR % 10 == 1 {getline f2 < "file1"; print f2} 1' file2 | cat -n

June 22, 2013 — openiduser102

Explanation

An alternative with line numbers.

text-processing file-manipulation
cat awk print

Related one-liners

Insert lines from one text file to another one 

sed -re ':a;Rfile1' -e 'x;s/^/./;/.{10}/!{x;ba};s/.*//;x' file2

June 22, 2013 — openiduser102