Condensing 3 commands to output backup information into a single command using tail which includes file names as section headers in the text file like this:
$ cat sources.txt
==> /etc/apt/sources.list <==
## This file is deprecated in Pop!_OS.
## See `man deb822` and /etc/apt/sources.list.d/system.sources.
==> /etc/apt/sources.list.d/brave-browser-release.list <==
# deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main
==> /etc/apt/sources.list.d/brave-browser-release.list.save <==
deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main
...
Condensing 3 commands to output backup information into a single command using tail which includes file names as section headers in the text file like this: