Solution 1:
A one-liner using bash, and shell utilities sort and comm:
comm -2 -3 <(sort {1..30}.txt) <(sort {31..90}.txt)
How to find common values in X files that do not occur in Y files
Solution 1:
A one-liner using bash, and shell utilities sort and comm:
comm -2 -3 <(sort {1..30}.txt) <(sort {31..90}.txt)