(tar.info.gz) Portable Names
8.3.1 Portable Names
Use portable file and member names. A name is portable if it contains
only ASCII letters and digits, `/', `.', `_', and `-'; it cannot be
empty, start with `-' or `//', or contain `/-'. Avoid deep directory
nesting. For portability to old Unix hosts, limit your file name
components to 14 characters or less.
If you intend to have your `tar' archives to be read under MSDOS,
you should not rely on case distinction for file names, and you might
use the GNU `doschk' program for helping you further diagnosing illegal
MSDOS names, which are even more limited than System V's.
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