Read the input as a whole

[Peng Yu]

Hi,

Both of the following commands can read a whole input. Are they always
the same under all possible input? Is there one preferred over the
other?

$ builtin printf '%s\n%s' abc 123 | awk.sh -e 'BEGIN { RS=""; getline;
print $0 }'
abc
123
$ builtin printf '%s\n%s\n' abc 123 | awk.sh -e 'BEGIN { RS="^$";
getline; print $0 }'
abc
123

-- 
Regards,
Peng