Adrian,
Couple of ways:

(hack)thebeast@ricklman# cat spaces.txt 
a b c d
e f g h
i j k l
(hack)thebeast@ricklman# sed -e "s/ /,/g" < spaces.txt > commas.txt

(hack)thebeast@ricklman# cat commas.txt 
a,b,c,d
e,f,g,h
i,j,k,l

Different syntax:

cat spaces.txt | sed -e "s/ /,/g" > commas.txt

Different tool than sed:

cat spaces.txt | tr ' ' ','

cat spaces.txt | awk '{gsub(" ",",",$0); print $0}'

Have fun,
--
Rick L. Mantooth
[EMAIL PROTECTED]
Very funny Scotty. now beam down my clothes.

On Wed, 29 Dec 1999, Adrian Walters wrote:

=> i know this has been asked a billion times, but howwould you take a space 
=> delimited file and put comas where the spaces are. a shell cript is 
=> preferred over a perl script
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