Devuan GNU+Linux is a free software operating system for your
computer. Free software means you are free to use, copy
and distribute, study, change the software, and share your
modifications with the community.
software freedom, your way
apt install cowdancer
utils : optional
Copy-on-write directory tree utility.
Tries to make copy-on-write semantics upon hard-link copied
directory trees generated with 'cp -la'
'cow-shell' command invokes a shell session. Within that session,
under the directory cow-shell was invoked,
cowdancer will create a new file when existing i-nodes are opened for
Useful for quick scratch workspace and experimentation.
For a useful Debian tool, try cowbuilder.