Obtain patterns in one file from another using ack or awk or better way than grep?

Question

Is there a way to obtain patterns in one file (a list of patterns) from another file using ack as the -f option in grep? I see there i

Answer 1

nawk 'FNR==NR{a[$0];next}($1 in a)' file3 file4

tested:

pearl.384> cat file3
a
c
e
pearl.385> cat file4
a  1 
b  2 
c  3 
d  4 
e  5
pearl.386> nawk 'FNR==NR{a[$0];next}($1 in a)' file3 file4
a  1 
c  3 
e  5
pearl.387>