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The POSIX Utility Syntax Guidelines specify that flag groups like -HL
should be handled like -H -L. GNU find doesn't support grouping flags
in this way, but BSD find does.
To avoid conflicts with non-flag primaries, for now we require at least
one flag in a group to be a capital letter. That is, we support things
like -Lds but not -ds. We also do not support -fPATH (without a space)
as it would conflict with -follow, -fprint, etc. It is impossible to be
compatible with both GNU and BSD find here:
user@gnu$ find -follow
link
link/file
...
user@bsd$ find -follow
find: ollow: No such file or directory
Link: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html
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