Date: Tue, 29 Mar 2005 20:54:51 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Danny Braniss <danny@cs.huji.ac.il> Cc: sthaug@nethelp.no Subject: Re: Heads up: gtar gone from base system Message-ID: <20050329105450.GC69824@cirb503493.alcatel.com.au> In-Reply-To: <E1DGBGs-000BPH-6z@cs1.cs.huji.ac.il> References: <12938.1112080352@bizet.nethelp.no> <E1DGBGs-000BPH-6z@cs1.cs.huji.ac.il>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, 2005-Mar-29 09:36:18 +0200, Danny Braniss wrote: >> > Brian missed a pair of parenthenis. The example should read: >> > >> > ( cd srcdir ; tar cf - . ) | ( cd destdir ; tar xpf - ) >> >> All the first perens does is leave you sitting wherever you were before >> starting, whereas my example would have left you sitting in srcdir. >> It makes no functional difference in the tar/untar job itself. It makes a significant difference if "destdir" is relative. >> same everywhere. I do it on Linux and FreeBSD too and I just verified on a >> 5.3 box just to make sure instead of relying on memory and common sense. >> It's still in my fingers too, used it for many years. Lately I have >> been using cp -pR for the same job. > >caution: > -R If source_file designates a directory, cp copies the directory and > the entire subtree connected at that point. This option also > causes symbolic links to be copied, rather than indirected through, > and for cp to create special files rather than copying them as nor- > mal files. Created directories have the same mode as the corre- > sponding source directory, unmodified by the process' umask. >****************************************************************************** > Note that cp copies hard linked files as separate files. If you > need to preserve hard links, consider using tar(1), cpio(1), or > pax(1) instead. >****************************************************************************** At work, we have a development toolchain which creates symlinks of the form "gui -> ." within its output trees and I regularly have to remind people not to use "cp -pR" (or samba) to copy the trees. I usually use "tar|tar" or "find|cpio" for tree copying. The latter has the option of being able to hardlink the files instead of copying them. -- Peter Jeremy
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050329105450.GC69824>