On 2023-02-17 at 15:21, Greg Wooledge wrote: > On Fri, Feb 17, 2023 at 01:49:59PM -0500, The Wanderer wrote: > >> I can't speak to the new version, as I'm still running 3.3.17-7.1 on my >> machine - but I can at least note that the man page from that older >> version also explicitly says "a blank-separated or comma-separated list" >> in the description for the '-o' option, but the given command line (with >> a pipe for a separator) still works. (This may reflect only the same >> thing that you said, above.) >> >> It's entirely possible that this was an intentional change, to bring >> things in line with the documentation, and/or even one required in order >> to be in line with some appropriate specification. > > Hmm... fair point. POSIX says: > > The application shall ensure that the format specification is a list of > names presented as a single argument, <blank> or <comma>-separated. > > So the behavior of ps in bullseye is an extension of the POSIX requirement, > and apparently only applies to the "AIX format specifiers", which are yet > another extension.
FWIW, at least in the 3.3.17-7.1 version I have, the man page claims that ps supports the POSIXLY_CORRECT environment variable. This type of more-strict POSIX compliance, even when it means being less capable, strikes me as the sort of thing that should probably be gated behind a check for that flag. > Nevertheless, this change definitely feels like a regression. Scripts > that are relying on the bullseye behavior, with full output formatting > capability, will no longer work in bookworm. > > I'm not using any such scripts, so I don't have anything to lose here, > but the OP might seriously want to get a bug report in, at least to > learn whether this is an intended regression, or an accidental one. Agreed, -- The Wanderer The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. -- George Bernard Shaw
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