I am creating then writing to a file in bash4, in a directory with root privileges.

I looked at these results from stackoverflow:
<https://unix.stackexchange.com/questions/37875/how-to-add-a-line-to-a-file-which-has-only-root-write-permission-and-to-continue>

But not helping me.
Below `$fName` contains path to file.

First I touch the file: `sudo touch $fName;`

I am writing a key value pair (YAML) and this works: 

```
echo " "$key": "$value

```

But when I try to write to the file `$fName` as in: 

```
sudo sh -c 'echo "  "$key": "$value >> $fName';

```

or even: 

```
sudo sh -c 'echo \"  "$key": "$value\ >> $fName';

```

does not work. 

Get various errors: 

> 
> Bad substitution, command not found etc.
> 
> 
> 

I was also trying to write to memory or /tmp and then move it to the directory.

Would that be a better idea? Somehow that did not work either.

Thank you for your help.