On Thu, Mar 03, 2022 at 07:44:35PM +0100, Stella Ashburne wrote: > Mon cheri > > > Sent: Thursday, March 03, 2022 at 11:50 PM > > From: "David Wright" <deblis@lionunicorn.co.uk> [...] > > In addition, when using "source-directory"¹, you can leave all the > > configuration files in place, and deactivate them by, say, adding > > a disallowed character to their filenames, rather than having to > > remove them. > > > Can you give me an example of (sic) adding a disallowed character to their filenames? Does Linux permit the use of forbidden characters in filenames? I think David meant "disallowed wrt the 'source-directory' statement in the interfaces file. The man page (man 5 interfaces) has this to say: "Similarly, "source-directory" keyword is used to source multiple files at once, without specifying them individually or using shell globs. Additionally, when "source-directory" is used, names of the files are checked to match the following regular expression: ^[a-zA-Z0-9_-]+$. In other words, the names must consist entirely of ASCII upper- and lower-case letters, ASCII digits, ASCII underscores, and ASCII minus- hyphens." I.e. all other characters would be "disallowed" in this context. E.g. renaming "my-cool-interface" to "#my-cool-interface" would exclude it from being included by a "source-directory" statement. As to your other question, that would depend on the file system, but as far as Linux is concerned, only the slash "/" and the NULL character are taboo for file names. Cheers -- t
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