==== Afficher le contenu de tous les fichiers sources valides d'apt. ====
<code=bash>find /etc/apt -type f -regex ".*\.\(list.*\|sources.*\)$" -exec bash -c 'echo -e "\n$1"; [[ "${1##*/}" =~ (list|sources)$ ]] && cat -n "$1"' _ '{}' \;</code>

Elle liste aussi tous les fichiers contenant //list// ou //sources// dans leur extension sans en afficher le contenu.

Un fichier source valide doit avoir l'extension **.list** ou **.sources**

=== Exemple de retour ===
<code>/etc/apt/sources.list

/etc/apt/sources.list.d/VirtualBox.sources
     1	# Sources pour VirtualBox
     2	
     3	Enabled: yes
     4	Types: deb
     5	URIs: https://download.virtualbox.org/virtualbox/debian
     6	Suites: bullseye
     7	Components: contrib
     8	Architectures: amd64
     9	Signed-by: /usr/share/keyrings/oracle_vbox_2016-archive-keyring.gpg /usr/share/keyrings/oracle_vbox-archive-keyring.gpg

/etc/apt/sources.list.d/paquets-sources.sources
     1	# Sources pour Bullseye :
     2	
     3	Enabled: no
     4	Types: deb-src
     5	Uris: https://deb.debian.org/debian
     6	Suites: bullseye bullseye-updates proposed-updates
     7	Components: main contrib non-free
     8	
     9	Enabled: no
    10	Types: deb-src
    11	URIs: https://security.debian.org/debian-security
    12	Suite: bullseye-security
    13	Components: main contrib non-free 

/etc/apt/sources.list.d/bullseye.sources
     1	# Sources list pour Bullseye :
     2	
     3	Types: deb
     4	URIs: https://deb.debian.org/debian
     5	Suites: bullseye bullseye-updates proposed-updates bullseye-backports
     6	Components: main contrib non-free
     7	
     8	Types: deb
     9	URIs: https://security.debian.org/debian-security
    10	Suites: bullseye-security
    11	Components: main contrib non-free</code>