I have a CSV file produced by MS Excel. Where merged cells exist in the original spreadsheet, the original rows containing these become multi-line in the CSV output. I would like to join these back into one line.

I am looking for a Unix (Solaris 10) tool (sed/awk/tr etc) that will join all lines not ending in a comma to the next line, while leaving all lines that end in a comma untouched. The newline character at the end of lines not ending in a comma would be replaced with a space.

E.g. If the input file contains:

```
,Dilbert,
,,Wally,
Alice,
Asok9
Dogbert:
Catbert,
Ratbert,

```

Then the resulting output will be:

```
,Dilbert,
,,Wally,
Alice,
Asok9 Dogbert: Catbert,
Ratbert,

```

Thanks.