Native file exist check

[Peng Yu]

Hi,

https://stackoverflow.com/questions/29284472/awk-check-file-exists

The following solution is shown above. But getline could potentially
read too much (for example processing a binary file in which a line
can be very long). Is there a more efficient awk native solution for
checking whether a file exist?

function file_exists(file) {
  n=(getline _ < file);
  if (n > 0) {
    print "Found: " file;
    return 1;
  } else if (n == 0) {
    print "Empty: " file;
    return 1;
  } else {
    print "Error: " file;
    return 0;
  }
}



-- 
Regards,
Peng