# Example usage:
awk 'FNR==NR{a[$1]=$2; next}; {if($9 in a) {print $0, " "a[$9];} else {print $0, " NA"}}' input_file_1 input_file_2
# This command does a VLOOKUP-type operation between two files using awk. With
# the numbers above, column 1 from input_file_1 is used an a key in an array
# with column 2 of input_file_1 as the match for the key. Column 9 of input
# _file_2 is then compared to the keys from input_file_1 and any matches
# return the associated match from input_file_1 (here, column 2).