How to add a column from a file to another file

Question

I have a file with two columns as

1 1
2 3
3 4

and a file with one column as

6
7
9

I would like to add the

Answer 1

awk 'NR==FNR{a[NR]=$0;next}{print a[FNR],$0}' file1 file2

Note: Will work with files of same length. If file lengths' are different, go with sudo_O's solution.

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Just for the heck of it, here is an awk command that I think should simulate paste. Purely for fun though, if I were you I would still go with sudo_O's solution (or may be not!)

awk 'NR==FNR{a[++y]=$0;next}{b[++x]=$0}
END{z=x>y?x:y;while(++i<=z){print a[i],b[i]}}' file1 file2