比较Linux中行尾的两个文件

Question

I would like to compare two files and get the output of matching string in one of the files at the end of the line:

Let's say I have two files:-

file1:

xyzabcdef
xyz
abcdefghi

file2:

fghjkl
wertyu
abcdef

I could do something like this:

grep -Fif file2 file1

This gives me the following output:

xyzabcdef
abcdefghi

This is because abcdef in file2 matches both of those lines in file1. However, what I would like is to just compare the end of the line in file1 to those in file2. So, I would like output to be:

xyzabcdef

Is there some magic command that will let me do this?

Answer 1

Extending Lars's solution which I think the best option. Simply use the following:

cat -E file2  | grep -if - file1 

The trick is to use -E option of cat to append $ at the end of each line. Then read the pattern from stdin using - option of grep. Also you have to use regex matching, so I removed the -F .

Answer 2

I would append $ to each line of file2 and use the command grep -if file2 file1 .

The $ is a regex and means "match at the end of the line". The option -F would use fixed string mode that is incompatible with regex, thus omit this option.

Answer 3

You can do it simply by reading each line in file2 and using each line as a search term for grep anchoring the term to the end of line with $ , eg:

$ while read -r line; do grep "${line}$" file1; done <file2
xyzabcdef