01-18-2009
tar command
Hi all,
Can anyone please say me what exactly a 'tar' command does? From what all I know, its not basically a compression tool. But I have seen many used it for compression purpose.
If you have any links or any stuff which can help me better understand about 'tar', that will be greatly appreciated...
It will be of great help for me if you can please put up some examples as well...
Thanks!
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LEARN ABOUT DEBIAN
xdelta3
XDELTA3(1) General Commands Manual XDELTA3(1)
NAME
xdelta3 - VCDIFF (RFC 3284) binary diff tool
SYNOPSIS
xdelta3 [command] [options] [input [output]]
DESCRIPTION
xdelta3 is a binary diff tool that uses the VCDIFF (RFC 3284) format and compression.
COMMANDS
config prints xdelta3 configuration
decode decompress the input, also set by -d
encode compress the input, also set by -e (default)
test run the builtin tests
printdelta
print information about the entire delta
printhdr
print information about the first window
printhdrs
print information about all windows
recode encode with new application/secondary settings
OPTIONS
standard options:
-0 .. -9
compression level
-c use stdout
-d decompress
-e compress
-f force overwrite
-h show help
-q be quiet
-v be verbose (max 2)
-V show version
memory options:
-B bytes source window size
-W bytes input window size
-P size compression duplicates window
-I size instruction buffer size (0 = unlimited)
compression options:
-s source source file to copy from (if any)
-S [djw|fgk]
enable/disable secondary compression
-N disable small string-matching compression
-D disable external decompression (encode/decode)
-R disable external recompression (decode)
-n disable checksum (encode/decode)
-C soft config (encode, undocumented)
-A [apphead]
disable/provide application header (encode)
-J disable output (check/compute only)
-T use alternate code table (test)
NOTES
The XDELTA environment variable may contain extra args:
XDELTA="-s source-x.y.tar.gz"
tar --use-compress-program=xdelta3 -cf
target-x.z.tar.gz.vcdiff target-x.y/
EXAMPLES
Compress the differences between SOURCE and TARGET, yielding OUT, using "djw" secondary compression:
xdelta3 -S djw -s SOURCE TARGET OUT
Do the same, using standard input and output:
xdelta3 -S djw -s SOURCE < TARGET > OUT
To decompress OUT, using SOURCE, yielding TARGET:
xdelta3 -d -s SOURCE OUT TARGET
AUTHOR
xdelta3 was written by Josh MacDonald <josh.macdonald@gmail.com>.
This manual page was written by Leo 'costela' Antunes <costela@debian.org> for the Debian project (but may be used by others).
Xdelta3 August 2009 XDELTA3(1)