bash print line if column value is in column of another file
# Example usage:
awk 'FNR==NR{a[$1]=$1; next}; $8 in a {print $0;}' input_file_1 input_file_2
# This command prints rows from input_file_2 if the value in a specific
# field of input_file_2 is found in a specific column of input_file_1.
# With these specific numbers, this function prints the row from
# input_file_2 if the value in column 8 is present in column 1 of
# input_file_1.