Using awk to pull specific lines from a file

Question

I have two files, one file is my data, and the other file is a list of line numbers that I want to extract from my data file. Can I use awk to read in my lines file, and the

Answer 1

awk 'NR == FNR {nums[$1]; next} FNR in nums' numberfile datafile

simply referring to an array subscript creates the entry. Looping over the first file, while NR (record number) is equal to FNR (file record number) using the next statement stores all the line numbers in the array. After that when FNR of the second file is present in the array (true) the line is printed (which is the default action for "true").