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# uname -a | nawk '{sub($2,"xxxxxxxx",$0)}1'
SunOS xxxxxxxx 5.10 Generic_141414-01 sun4u sparc SUNW,Sun-Fire-V490
# echo...

I believe below one would help to resolve
sed 's/\(<cr>\)\1*/<CR>/g' inputfile

replace all x into y?
or only in 2nd line?
or in lines that match some pattern? e.g. starts with 5?

the codes below change any x-fields to y only in the 2nd line.
awk '{if...

If it is literally a replace of the full stop character with NA, then you could try:-
echo ":%s /\./NA/\nwq"|vi filename

It may not work if:-

Your file has long lines over 2048 bytes,
Your...

sed 's/\./NA/g' infileOr ... if you never have more than 1 dot per line you can go with
sed 's/\./NA/' infile

if you wan only replace the single dot , not those like 12.65849

then
sed...

because dot has a special meaning when interpreted as a regular expression it means 'any single character' so it needs to be "escaped" using the backslash

printf ",s/\./NA/\nw\nq\n" | ed -s infile

Using awk
If you just want to replace the . in the 3rd column

awk '{if($3==".") print $1" "$2" NA";else print}' infile

The correct way to print an arbitrary string with printf is printf "%s", $0