My reading of this:
leads me to believe that this on the source side, not on the target side. In other words, tar obtains the inode times, reads the file into the accumulation of the output file, then resets the inode times to the original.
Some filesystems are set not to even record the access times, since it is often of limited value and causes disk activity.
If my supposition is correct, then one could use touch to reset the access times on the target -- tedious, but doable.
Perhaps someone will stop by with a definitive answer ... cheers, drl
Just dusted off an old version of the Byte UNIX Benchmarks from our old benchmark days at http://linux.silkroad.com/ and ran them against www.unix.com:
==============================================================
BYTE UNIX Benchmarks (Version 3.11)
System -- Linux www 2.4.20 #2 Mon... (0 Replies)
I know this should be easy, but Google is not turning up any results:
How can I find out what version of software (like tar and gzip) I have installed on my Sun box?
Thanks! (3 Replies)
sorry for my English
We'll report about Unix in my school, for Operating Systems subject...
with Installation demo....
I'm wondering if System V, which is from original developers AT&T still exist
and downloadable? because I cant find it anywhere...
then i found out that Solaris, MacOS... (4 Replies)
Guys,
I need to know what version of tar i am using in our HP B11.11 box (model = 9000/800/rp8420 ).
We have created a tar file and i wanted to know if the tar version i used supported 8GB-sized files (Check sanity of the archived file). As you know old version of tar is limited to files... (0 Replies)
HI,
if I have a tarfile called pmapdata.tar that contains
tar -tvf pmapdata.tar
-rw-r--r-- 0/0 21 Oct 15 11:00 2009 /var/tmp/pmapdata/pmap4628.txt
-rw-r--r-- 0/0 21 Oct 14 20:00 2009 /var/tmp/pmapdata/pmap23752.txt
-rw-r--r-- 0/0 1625 Oct 13 20:00 2009... (1 Reply)
hello,
i've a backup of a xen image which was tar'ed. i extracted the tarfile with --preserve and moved it to the lvm partition useing cp -p to preserve the ownership informations of the files in this step too.
but unfortunatly after extracting the archive some uid and guids which are present... (5 Replies)
Hi,
I do have question for un tar a file. I have several 'tar'ed files. For example: SRS.tar.bz2. I was trying to untar them in a linux server using the command:
tar xvjf SRS.tar.bz2
It worked perfectly. but when I open this file in my mac computer all the files are extracted into a... (7 Replies)
There are some duplicate field on description column .I want to print duplicate row along with highest version of number and corresponding description column.
file1.txt
number Description
=== ============
34567 nl21a00is-centerdb001:ncdbareq:Error in loading init
34577 ... (7 Replies)
Discussion started by: vijay_rajni
7 Replies
LEARN ABOUT V7
tar
TAR(1) General Commands Manual TAR(1)NAME
tar - tape archiver
SYNOPSIS
tar [ key ] [ name ... ]
DESCRIPTION
Tar saves and restores files on magtape. Its actions are controlled by the key argument. The key is a string of characters containing at
most one function letter and possibly one or more function modifiers. Other arguments to the command are file or directory names specify-
ing which files are to be dumped or restored. In all cases, appearance of a directory name refers to the files and (recursively) subdirec-
tories of that directory.
The function portion of the key is specified by one of the following letters:
r The named files are written on the end of the tape. The c function implies this.
x The named files are extracted from the tape. If the named file matches a directory whose contents had been written onto the tape,
this directory is (recursively) extracted. The owner, modification time, and mode are restored (if possible). If no file argument
is given, the entire content of the tape is extracted. Note that if multiple entries specifying the same file are on the tape, the
last one overwrites all earlier.
t The names of the specified files are listed each time they occur on the tape. If no file argument is given, all of the names on
the tape are listed.
u The named files are added to the tape if either they are not already there or have been modified since last put on the tape.
c Create a new tape; writing begins on the beginning of the tape instead of after the last file. This command implies r.
The following characters may be used in addition to the letter which selects the function desired.
0,...,7 This modifier selects the drive on which the tape is mounted. The default is 1.
v Normally tar does its work silently. The v (verbose) option causes it to type the name of each file it treats preceded by the
function letter. With the t function, v gives more information about the tape entries than just the name.
w causes tar to print the action to be taken followed by file name, then wait for user confirmation. If a word beginning with `y'
is given, the action is performed. Any other input means don't do it.
f causes tar to use the next argument as the name of the archive instead of /dev/mt?. If the name of the file is `-', tar writes
to standard output or reads from standard input, whichever is appropriate. Thus, tar can be used as the head or tail of a filter
chain Tar can also be used to move hierarchies with the command
cd fromdir; tar cf - . | (cd todir; tar xf -)
b causes tar to use the next argument as the blocking factor for tape records. The default is 1, the maximum is 20. This option
should only be used with raw magnetic tape archives (See f above). The block size is determined automatically when reading tapes
(key letters `x' and `t').
l tells tar to complain if it cannot resolve all of the links to the files dumped. If this is not specified, no error messages are
printed.
m tells tar to not restore the modification times. The mod time will be the time of extraction.
FILES
/dev/mt?
/tmp/tar*
DIAGNOSTICS
Complaints about bad key characters and tape read/write errors.
Complaints if enough memory is not available to hold the link tables.
BUGS
There is no way to ask for the n-th occurrence of a file.
Tape errors are handled ungracefully.
The u option can be slow.
The b option should not be used with archives that are going to be updated. The current magtape driver cannot backspace raw magtape. If
the archive is on a disk file the b option should not be used at all, as updating an archive stored in this manner can destroy it.
The current limit on file name length is 100 characters.
TAR(1)