file-format

#! /usr/bin/awk -f
# file-format (AWK script) -- Reports line ending type for a group of files
#
# Note: in awk, it is impossible to tell if the last line doesn't have an LF

# Shows the info for a the file that was just processed
function show_info()
{
  printf("%s:\tlines: %d, CRs: %d, format: %s\n",
         prev_filename, prev_nr, cr_count,
         cr_count == 0 ? "Unix" : (prev_nr != cr_count ? "MISMATCH" : "dos") );
}


# *** MAINLINE ***
# Initialise at the start of each new file
FNR == 1 {
           if (prev_filename != "")
           {
             show_info();
           }
           
           cr_count = 0;
           # Track the filename ready for use at END or when a file change occurs
           prev_filename = FILENAME;
         } 

/\r$/ { ++cr_count; }
{ prev_nr = FNR; }

END { 
      show_info();
    }