>

> > How to do this in a single command?
>
> sed -e 's/[123-]/ /g'  <your_file_name>
>
> remove the 'g' at the end if you want to replace only the first
> instance (in the line).
>
> Thanks for this useful tip.

sed is a good choice for replacing text in files, as I am using it in
Fedora kickstart files for modifying many of the system configuration files
after post installation.

S.Baskar
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