Question

I am opening the multiple files with awk and i testing this command

I am trying this for testing

awk -F"," 'NR==FNR{print FILENAME} {print FILENAME}' file2.txt file1.txt

The second block should execute when NR != FNR but for me its executing all the time.

IS this syntax correct

Answer 1

Since you haven’t specified a pattern for the second action, it always executes. If you only want it to execute when NR!=FNR, try something like:

NR==FNR { printf("NR==FNR, Filename=%s", FILENAME); }
NR!=FNR { printf("NR!=FNR, Filename=%s", FILENAME); }

For better or worse, there’s no else for patterns, so you normally end up specifying each explicitly.