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 |
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decode |
decompress the input, also set by -d |
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encode |
compress the input, also set by -e (default) |
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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 |
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-d |
decompress |
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-e |
compress |
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-f |
force overwrite |
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-h |
show help |
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-q |
be quiet |
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-v |
be verbose (max 2) |
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-V |
show version |
memory options:
-B |
bytes source window size |
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-W |
bytes input window size |
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-P |
size compression duplicates window |
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-I |
size instruction buffer size (0 = unlimited) |
compression options:
-s |
source source file to copy from (if any) |
-S [djw|fgk|lzma|none]
enable/disable secondary compression
-N |
disable small string-matching compression |
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-D |
disable external decompression (encode/decode) |
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-R |
disable external recompression (decode) |
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-n |
disable checksum (encode/decode) |
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-C |
soft config (encode, undocumented) |
-A [apphead]
disable/provide application header (encode)
-J |
disable output (check/compute only) |
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-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 [AT] gmail.com>.
This manual page was written by Leo ’costela’ Antunes <costela [AT] debian.org> for the Debian project (but may be used by others).