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I wanted to disable a file in /etc/apt/sources.list.d. I changed the extension to something else than .list. It was disabled but I still had a notification N: Ignoring file 'foo.list_backup' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension. In man sources.list, I found :

[...] Otherwise APT will print a notice that it has ignored a file, unless that file matches a pattern in the Dir::Ignore-Files-Silently configuration list - in which case it will be silently ignored.

If I do apt-config dump | grep -i silent, I get a list of patterns but I cannot find those patterns in grep -i silent /etc/apt/apt.conf -R /etc/apt/apt.conf.d.

Where are "the Dir::Ignore-Files-Silently configuration list" stored ?

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  • Read man apt.conf, as referenced in the man page you quoted. – waltinator Jul 26 '20 at 21:17
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It seems that a base list is built-in.

The Ignore-Files-Silently list can be used to specify which files APT should silently ignore while parsing the files in the fragment directories. Per default a file which ends with .disabled, ~, .bak or .dpkg-[a-z]+ is silently ignored. As seen in the last default value these patterns can use regular expression syntax. [apt.conf manpage]

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