Linus Torvalds wrote: > On Sun, Mar 14, 2021 at 7:32 PM Rong Chen <[email protected]> wrote: > > > > It can be reproduced with '-a' option in dash: > > Oh, ok. That kind of explains it. > > 'dash' is trash. Please somebody make a bug report. > > > $ a="!" > > $ [ "$a" = ".size" ] > > $ [ "$a" = ".size" -a "$b" = ".LPBX0," ] > > sh: 2: [: =: unexpected operator > > This is 100% a dash bug. There is no question what-so-ever about it. > This is not some kind of "POSIX is ambiguous", or "the handling of > '-a' is complicated". > > It's simply just that dash is buggy. > > > While dash supports most uses of the -a and -o options, they have > > very confusing semantics even in bash and are best avoided. > > No, they have perfectly sane semantics in bash, and in POSIX. > > See > > https://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html > > and there is absolutely zero question that bash does this correctly, > and dash does not. > > But yes, it seems to be easy to work around, but still - could some > Ubuntu person please open a bug report on dash?
fwiw, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850202
