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Full Discussion: How to "clone" a directory and it's symlink?
Top Forums UNIX for Dummies Questions & Answers How to "clone" a directory and it's symlink? Post 302684983 by alister on Friday 10th of August 2012 12:01:36 PM
Old 08-10-2012
Quote:
Originally Posted by alister
pax should be available on any UNIX system (GNU's Not UNIX Smilie).
Quote:
Originally Posted by raggmopp
True, pax SHOULD be available. But sometimes it is not.
I think some distros install by default and some don't. With cpio it is always installed by default.
pax is present on OS X, Solaris, AIX, HP-UX, FreeBSD, NetBSD, OpenBSD, IRIX, etc. On some of those platforms it has been included since the mid-90s. GNU/Linux is the only notable exception, which is why I specifically said "UNIX" and included the GNU parenthetical.


Quote:
Originally Posted by Corona688
Basically -- tar won. It got standardized and modernized in POSIX. cpio didn't.
If by "won" you mean that it's ubiquitous. Agreed. But standardized? You must be joking.

tar is not standardized in any way. There is no POSIX standard. There isn't even a defacto standard. There are about as many different implementations with conflicting syntaxes as there are operating systems.

tar is very much like ps. It is guaranteed to be available on just about any system you use, but if portability is a concern, you will need to restrict your usage to its simplest features. The moment you need to portably do anything fancy, you're screwed.

If GNU/Linux distributors would ship pax, pax would be the first standardized (on paper and in practice) archiver available on just about every platform.

Regards,
Alister
Last edited by alister; 08-10-2012 at 01:07 PM..
 

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LEARN ABOUT FREEBSD

archive_write_set_format_pax_restricted

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
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