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The archive format defined by the POSIX.1-1988 specification is
called ustar
. Although it is more flexible than the V7 format, it
still has many restrictions (see ustar, for the detailed
description of ustar
format). Along with V7 format,
ustar
format is a good choice for archives intended to be read
with other implementations of tar
.
To create an archive in ustar
format, use the --format=ustar
option in conjunction with --create (-c).