in reply to Re^5: Detect line endings with CGI.pm upload
in thread Detect line endings with CGI.pm upload

Not true. 

>perl -le"print length qq{\n}"
1

>perl -le"print unpack 'H*', qq{\n}"
0a

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It's not true in C either. 

#include <string.h>
#include <stdio.h>

int main() {
   printf("%d\n", strlen("\n"));

   {
      const char* p = "\n";
      while (*p) {
         printf("%02x", *(p++));
      }
      printf("\n");
   }

   return 0;
}

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1
0a

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In Perl, LF gets converted to CRLF on input/output when the crlf PerlIO layer is used. While the string is in memory, you want to work with just LF, and \n is just LF.

In Section Seekers of Perl Wisdom