A .pacnew file may be created during a package upgrade to avoid overwriting a file which already exists. A .pacsave file may be created during a package removal, or by a package installation of a package that was removed. These files require manual intervention from the user and it is good practice to handle them regularly. The program pacdiff can help manage this process. For example, here is what it looks like when the /etc/default/grub grub file has changed:
sudo DIFFPROG=diff pacdiff|result=
==> pacnew file found for /etc/default/grub
:: (V)iew, (S)kip, (R)emove pacnew, (O)verwrite with pacnew, (Q)uit: [v/s/r/o/q]
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