UNIX for Dummies Questions & Answers

I have following simple file called testing.txt

...
key1=value1,key2=value2,key3=value3 ... and so on

I am trying to change it to

key1=value1
key2=value2
key3=value3

I tried to use following code

sed 's/,/\n/g' testing.txt > temp.txt && mv temp.txt testing.txt

Yet, what I am getting is
key1=value1nkey2=value2nkey3=value3n ....

I thought that '\n' is the end of line characters. I guess I can not use it.
Any ideas?

$ tr ',' '\n' < testing.txt > newfile.txt && mv newfile.txt testing.txt
$ cat testing.txt
key1=value1
key2=value2
key3=value3

it worked. thank you very much

\n works with some version of sed.
Try this

Code:

echo "key1=value1,key2=value2,key3=value3 " |
sed "s/,/\\
/g"