vac(1) - Plan 9 from User Space

From adc93f6097615f16d57e8a24a256302f2144ec4e Mon Sep 17 00:00:00 2001 From: rsc Date: Fri, 14 Jan 2005 17:37:50 +0000 Subject: cut out the html - they're going to cause diffing problems. --- man/man1/vac.html | 160 ------------------------------------------------------ 1 file changed, 160 deletions(-) delete mode 100644 man/man1/vac.html (limited to 'man/man1/vac.html') diff --git a/man/man1/vac.html b/man/man1/vac.html deleted file mode 100644 index 71f121ff..00000000 --- a/man/man1/vac.html +++ /dev/null @@ -1,160 +0,0 @@ - -vac(1) - Plan 9 from User Space - - - - -

VAC(1) VAC(1) -

-
-

NAME
- -
- - vac – create a vac archive on Venti
- -
-

SYNOPSIS
- -
- - vac [ −mqsv ] [ −b blocksize ] [ −d oldvacfile ] [ −e exclude - ] [ −f vacfile ] [ −i name ] [ −h host ] file ...
- -
-

DESCRIPTION
- -
- - Vac creates an archival copy of Plan 9 file trees on Venti. It - can be used to build a simple backup system. One of the unusual - properties of Venti is that duplicate blocks are detected and - coalesced. When vac is used on a file tree that shares data with - an existing archive, the consumption of storage will be approximately - equal to an incremental backup. This reduction in storage consumption - occurs transparently to the user. -
- - As an optimization, the −d and −q options, described below, can - be used to explicitly create an archive relative to an existing - archive. These options do not change the resulting archive generated - by vac, but simply reduce the number of write operations to Venti. - -
- - The output of vac is the hexadecimal representation of the Sha1 - fingerprint of the root of the archive, in this format:
- -
- - vac:64daefaecc4df4b5cb48a368b361ef56012a4f46 - - - - -
- Option to vac are:
- −b blocksize
- -
- - Specifies the block size that data will be broken into. The units - for the size can be specified by appending k to indicate kilobytes. - The default is 8k. The size must be in the range of 512 bytes - to 52k.
- -
- −d oldvacfile
- -
- - Reduce the number of blocks written to Venti by comparing the - files to be stored with the contents of an existing vac file tree - given by oldvacfile.
- -
- −e exclude
- -
- - Do not include the file or directory specified by exclude. This - option may be repeated multiple times.
- -
- −f vacfile
- -
- - The results of vac are place in vacfile, or the standard output - if no file is given.
- -
- −i name
- -
- - Include standard input as one of the input files, storing it in - the archive with the specified name.
- -
- −h host
- -
- - The network address of the Venti server. The default is taken - from the environment variable venti.
- -
- −m    Expand and merge any vac archives that are found while reading - the input files. This option is useful for building an archive - from a collection of existing archives. Each archive is inserted - into the new archive as if it had been unpacked in the directory - in which it was found. Multiple archives can be unpacked in - -
- - a single directory and the contents will be merged. To be detected, - the archives must end in .vac. Note, an archive is inserted by - simply copying the root fingerprint and does not require the archive - to be unpacked.
- -
- −q    Increase the performance of the −d option by detecting unchanged - files based on a match of the files name and other meta data, - rather than examining the contents of the files.
- −s    Print out various statistics on standard error.
- −v    Produce more verbose output on standard error, including the - name of the files added to the archive and the vac archives that - are expanded and merged.
- -
-

SOURCE
- -
- - /usr/local/plan9/src/cmd/vac - -
-

SEE ALSO
- -
- - Plan 9’s vacfs(4) and venti(8)
- -
- -

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