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Full Discussion: Pipelining with tar
Top Forums UNIX for Dummies Questions & Answers Pipelining with tar Post 302460401 by DGPickett on Wednesday 6th of October 2010 05:07:15 PM
Old 10-06-2010
tar is very old, like dd and a few others, before UNIX command structure gelled, and it writes a lot of nulls because it wants your tape records to be standard length. If you do not have tape records, use cpio, which is what scp -r and rcp -r use and which has a pass option. Once, I updated a whole subtree in Hong Kong from Nj over 56K WAN using:

(cd source; find ...|cpio ...)|gzip -9 | rsh remote_host "cd target;gunzip | cpio -u ..."

exact options vary. This is very like 'scp -Crp ....' I like the -c for control strings in characters (compress better and platform independent). Be careful of all the *cp -r options, as if the target already exists and is a dir, it puts source things beneath it, but if not, it creates it, so you tend to accidentally get dir1/dir1/..., easily fixed with a move, but just remember some *cp -r commands are not repeatable.
 

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LEARN ABOUT SUNOS

cpio

cpio.h(3HEAD)							      Headers							     cpio.h(3HEAD)

NAME

       cpio.h, cpio - cpio archive values

SYNOPSIS

       #include <cpio.h>

DESCRIPTION

       Values needed by the c_mode field of the cpio archive format are described as follows:

       Name		 Description
       C_IRUSR		 Read by owner
       C_IWUSR		 Write by owner
       C_IXUSR		 Execute by owner
       C_IRGRP		 Read by group
       C_IWGRP		 Write by group
       C_IXGRP		 Execute by group
       C_IROTH		 Read by others
       C_IWOTH		 Write by others
       C_IXOTH		 Execute by others
       C_ISUID		 Set user ID
       C_ISGID		 Set group ID
       C_ISVTX		 On directories, restricted deletion flag
       C_ISDIR		 Directory
       C_ISFIFO 	 FIFO
       C_ISREG		 Regular file
       C_ISBLK		 Block special
       C_ISCHR		 Character special
       C_ISCTG		 Reserved
       C_ISLNK		 Symbolic link
       C_ISSOCK 	 Socket

       The header defines the symbolic constant:

       MAGIC	     "070707"

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pax(1), attributes(5), standards(5)

SunOS 5.10							    10 Sep 2004 						     cpio.h(3HEAD)
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