LZW and MPE names

LZW and MPE names

Post by Greg Stige » Sat, 26 Feb 2005 12:01:03


I'm testing compressing files with LZW before ftping, to fit the ftp within
a tight window. And while the results are impressive (nine *** minutes to
send uncompressed, versus four to compress, send, and decompress), one thing
escapes me. I do not see how to prevent LZW in batch from using the group
and account names for the compresses files. Or conversely, to get them
archived without the group and account in their names.

Greg Stigers

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LZW and MPE names

Post by Hans-Ole K » Sat, 26 Feb 2005 18:31:02

Greg,

Suppose you have got the latest version of LZW from Telamon/VYTek (A.03.54).

If your concern is re. restore of data to other groups/accounts than the
original ones, LZW has full built-in support for this - at least for the
latest version AFAIK. Isn't it like :STORE et al. You cannot prevent :STORE
from storing the full path to the files.

- A nifty feature we use: If you add PM capability to the LZW-program, it
will handle Image databases and other PRIV files as well.

Yes, it's a very useful program. Thanks to whoever ported it (anyone
remembers?)


Mange hilsner / With kind regards

Hans-Ole

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-----Original Message-----
From: HP-3000 Systems Discussion [mailto: XXXX@XXXXX.COM ] On Behalf
Of Greg Stigers
Sent: Friday, February 25, 2005 3:55 AM
To: XXXX@XXXXX.COM
Subject: LZW and MPE names

I'm testing compressing files with LZW before ftping, to fit the ftp within
a tight window. And while the results are impressive (nine *** minutes to
send uncompressed, versus four to compress, send, and decompress), one thing
escapes me. I do not see how to prevent LZW in batch from using the group
and account names for the compresses files. Or conversely, to get them
archived without the group and account in their names.

Greg Stigers

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* etc., please visit http://www.yqcomputer.com/ *

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LZW and MPE names

Post by Randy Med » Sun, 27 Feb 2005 05:01:04

Rumours of my death are optimistic and premature.

LZW can't be compelled to not store the fully-qualified filenames, but
it can be told to ignore them during the restore process.

From the built-in help, such that it is:

...
Restore file(s) from archive (also -restore)
...
-l[ocal] Restore into logon group (:RESTORE;LOCAL)
-group [.]grp Restore changing all files' groups (:RESTORE;GROUP=)
-acct [.]acct Restore changing all files' accounts (:RESTORE;ACCT=)
...

Adding '-local' will cause an originally stored FOO.PUB.SYS to be
restored as FOO in the logon group/account.

Adding '-group other' will cause it to be restored as FOO.other
in the logon account.

Adding '-acct other' will cause it to be restored as FOO.PUB.other.

Needless to say, you'll need latest/greatest versions, since these
options were added way back in April, '96.

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LZW and MPE names

Post by Greg Stige » Sun, 27 Feb 2005 05:46:02

In response to Hans-Ole, we are on Version A.03.31 [A.02.04] (Dec 3 1996),
but could get current. Are there circumstances under which LZW can store a
temp file?

Greg Stigers

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LZW and MPE names

Post by Paul Chris » Sun, 27 Feb 2005 08:16:02

Greg,

By default LZW, when it is asked to store a single file, will 'look' for
the file in the 'temp' domain first and then in the 'old'. You'll have
somewhat of a difficult time in restoring said file, however, in the sense
that you'll need to use the '-temp' switch and restore the file back into
the temporary domain.

The current version of LZW does not provide for restoring directly into
the 'old' domain. You'll need to restore it into the 'temp' domain and
then save it.

Regards
Paul Christidis


HP-3000 Systems Discussion < XXXX@XXXXX.COM > wrote on 02/25/2005
12:41:00 PM:

1996),
a

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LZW and MPE names

Post by Greg Stige » Sun, 27 Feb 2005 12:31:03

I'm sorry that I did not make this clear, but the target system is Windows
2000. I have downloaded and uploaded Version A.03.55 [A.02.04] (Feb 25 2005)
to our 3000, and Version A.03.54 [A.02.04] (Jan 29 2004) on our Windows
server. And it looks like it all works just fine with our temp files. We may
wind up using this on our Linuxen boxen as well. Thanks to everyone who
replied, and especially to Randy Medd.

Greg Stigers

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LZW and MPE names

Post by Randy Med » Wed, 02 Mar 2005 01:31:23

> The current version of LZW does not provide for restoring directly

where "current" refers to versions prior to Feb 25, 2005. The current
build (A.03.55) now respects the file's original domain, restoring
temp files appropriately, without requiring the '-temp' command-line
option. '-temp' will still force originally permanent files to be
restored as temp files, however, the original intent of the option.
This update affects the MPE versions, only - none of the other
platform versions were rebuilt.

BTW, many of the original versions won't be getting rebuilt, as we
have officially retired some of our older Unix boxes, specifically
SunOS 4.1, SCO, SGI and AT&T NCR.

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