09-28-2014
Quote:
Originally Posted by
Peasant
... ... ...
Isn't tar -z switch actually non standard tar implementation ?
Tar is an archiver not a compresser as far as i know.
Regards
Peasant.
Neither
tar nor
cpio are in the standards. The
pax utility is in the standards and can read and write archives in the formats used by both
tar and
cpio. The standards do not specify an option to have
pax process compressed archives, but most implementations that provide the
tar -z option or the
cpio -z option also provide a
pax extension to produce compressed archives in either format.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT FREEBSD
archive_write_format
ARCHIVE_WRITE_FORMAT(3) BSD Library Functions Manual ARCHIVE_WRITE_FORMAT(3)
NAME
archive_write_set_format_cpio, archive_write_set_format_pax, archive_write_set_format_pax_restricted, archive_write_set_format_shar,
archive_write_set_format_shar_dump, archive_write_set_format_ustar -- functions for creating archives
LIBRARY
Streaming Archive Library (libarchive, -larchive)
SYNOPSIS
#include <archive.h>
int
archive_write_set_format_cpio(struct archive *);
int
archive_write_set_format_pax(struct archive *);
int
archive_write_set_format_pax_restricted(struct archive *);
int
archive_write_set_format_shar(struct archive *);
int
archive_write_set_format_shar_dump(struct archive *);
int
archive_write_set_format_ustar(struct archive *);
DESCRIPTION
These functions set the format that will be used for the archive.
The library can write POSIX octet-oriented cpio format archives, POSIX-standard ``pax interchange'' format archives, traditional ``shar'' ar-
chives, enhanced ``dump'' shar archives that store a variety of file attributes and handle binary files, and POSIX-standard ``ustar'' ar-
chives. The pax interchange format is a backwards-compatible tar format that adds key/value attributes to each entry and supports arbitrary
filenames, linknames, uids, sizes, etc. ``Restricted pax interchange format'' is the library default; this is the same as pax format, but
suppresses the pax extended header for most normal files. In most cases, this will result in ordinary ustar archives.
RETURN VALUES
These functions return ARCHIVE_OK on success, or ARCHIVE_FATAL.
ERRORS
Detailed error codes and textual descriptions are available from the archive_errno() and archive_error_string() functions.
SEE ALSO
tar(1), libarchive(3), archive_write(3), archive_write_set_options(3), cpio(5), mtree(5), tar(5)
BSD
February 2, 2012 BSD