Arch Linux – How to Restore a Deleted Command

Arch isn't designed to work like that: it is a rolling release, so you are always going to have to continue to upgrade packages as they are pushed to your repo: the only alternative is to freeze everything.

Having said that, what you are asking can best be managed, within the Arch framework by doing two things:

1. updating regularly (so that you are only upgrading small numbers of packages at a time) and using the logs in /var/log/pacman.log to provide a list of packages to rollback if something does go wrong.

2. Not clearing the cache of packages prematurely, or—if you need the space—before you do issue a pacman -Sc or pacman -Scc, then backing up /var/cache/pacman/pkg/ to an external drive so that you have access to older versions if you do need to downgrade a package or packages.

If you are not running the [Testing] repo, then the reality is there is very little in the way of breakage and when it happens it is well-documented. As wojox noted, reading is a prerequisite for maintaining a well-running Arch Linux installation.

For Linux in general, you can use a tool like Clonezilla to make snapshots of your current install.

Caveat All of the above is referring to your system. You should, of course, have a regime in place to back up your data.

You should mv the file out of the way:

mv /etc/bluetooth/main.conf /etc/bluetooth/main.conf.old
apt-get -o DPkg::options::=--force-confmiss --reinstall install bluez

I don't know if you can get apt to overwrite an existing config file, that's why you should move it out of the way first.