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Full Discussion: Bash Help. CP v. MV
Top Forums Shell Programming and Scripting Bash Help. CP v. MV Post 302553487 by alister on Wednesday 7th of September 2011 05:58:34 PM
Old 09-07-2011
I haven't used it in a while, but pax is probably better than tar for copying files while preserving their original hierarchy. Better in the sense that it's simpler to use since it can read the pathnames on stdin. Also, it can do the job with a single invocation, instead of requiring one instance to create an archive and another to extract it. For example, to move all jpg files while preserving their locations relative to each other:
Code:
find source -name '*.jpg' | pax -rw destination

If I'm not mistaken, the same goes for cpio (although with different options).

Another advantage is that the number of archive members is not limited by ARG_MAX. Even if you use xargs to invoke tar, you are still bound by that limit. Should xargs invoke tar more than once, it would be as if multiple archives had been concatenated and piped into the extracting tar process: cat 1.tar 2.tar | tar -xf - won't work (at least not with the implementations of tar that I use, which only succeed in untarring the first archive).

Availability, however, could be a potential drawback. While you can count on pax and cpio to be present on *BSD and Linux systems, I'm not certain if you can on the proprietary unices. Interestingly, of the three, pax is the only utility that POSIX attempts to standardize.

Regards,
Alister
Last edited by alister; 09-07-2011 at 07:16 PM..
 

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LEARN ABOUT NETBSD

dh_installdeb

DH_INSTALLDEB(1)						     Debhelper							  DH_INSTALLDEB(1)

NAME

       dh_installdeb - install files into the DEBIAN directory

SYNOPSIS

       dh_installdeb [debhelperoptions]

DESCRIPTION

       dh_installdeb is a debhelper program that is responsible for installing files into the DEBIAN directories in package build directories with
       the correct permissions.

FILES

       package.postinst
       package.preinst
       package.postrm
       package.prerm
	   These maintainer scripts are installed into the DEBIAN directory.

	   Inside the scripts, the token #DEBHELPER# is replaced with shell script snippets generated by other debhelper commands.

       package.triggers
       package.shlibs
	   These control files are installed into the DEBIAN directory.

	   Note that package.shlibs is only installed in compat level 9 and earlier.  In compat 10, please use dh_makeshlibs(1).

       package.conffiles
	   This control file will be installed into the DEBIAN directory.

	   In v3 compatibility mode and higher, all files in the etc/ directory in a package will automatically be flagged as conffiles by this
	   program, so there is no need to list them manually here.

       package.maintscript
	   Lines in this file correspond to dpkg-maintscript-helper(1) commands and parameters.  However, the "maint-script-parameters" should not
	   be included as debhelper will add those automatically.

	   Example:

	       # Correct
	       rm_conffile /etc/obsolete.conf 0.2~ foo
	       # INCORRECT
	       rm_conffile /etc/obsolete.conf 0.2~ foo -- "$@"

	   In compat 10 or later, any shell metacharacters will be escaped, so arbitrary shell code cannot be inserted here.  For example, a line
	   such as "mv_conffile /etc/oldconffile /etc/newconffile" will insert maintainer script snippets into all maintainer scripts sufficient
	   to move that conffile.

	   It was also the intention to escape shell metacharacters in previous compat levels.	However, it did not work properly and as such it
	   was possible to embed arbitrary shell code in earlier compat levels.

	   The dh_installdeb tool will do some basic validation of some of the commands listed in this file to catch common mistakes.  The
	   validation is enabled as a warning since compat 10 and as a hard error in compat 12.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

11.1.6ubuntu2							    2018-05-10							  DH_INSTALLDEB(1)
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