Shell Programming and Scripting

Good day,

I have a list of regular expressions in file1. For each match in file2, print the containing line and the line after.

file1:
file2:
Output:
I can match a regex and print the line and line after

Code:

awk '{lines[NR] = $0} /Macrosiphum_rosae/ {print lines [NR]; print lines [NR-1]} '

And I found code online to print lines in file2 based on matches in file1 (untested by me)

Code:

awk 'NR==FNR{a[$0]=1;next} {n=0;for(i in a){if($0~i){n=1}}} n' file1 file2

But I'm looking for help in combining the two if anyone would be so kind.

---------- Post updated at 01:50 AM ---------- Previous update was at 12:46 AM ----------


UPDATE:

I was able to solve this.

Code:

awk 'NR==FNR{a[$0]=1;next} {n=0;for(i in a){if($0~i){n=1}}} n {print;getline;print}' file1 file2

If you're using GNU grep, you can try this:

Code:

grep -A1 -f file1 file2