XDELTA3(1) General Commands Manual XDELTA3(1)

xdelta3 - VCDIFF (RFC 3284) binary diff tool

xdelta3 [command] [options] [input [output]]

xdelta3 is a binary diff tool that uses the VCDIFF (RFC 3284) format and compression.

prints xdelta3 configuration
decompress the input, also set by -d
compress the input, also set by -e (default)
run the builtin tests
print information about the entire delta
print information about the first window
print information about all windows
encode with new application/secondary settings

standard options:
-0 .. -9
compression level
use stdout
force overwrite
show help
be quiet
be verbose (max 2)
show version
memory options:
bytes source window size
bytes input window size
size compression duplicates window
size instruction buffer size (0 = unlimited)
compression options:
source source file to copy from (if any)
-S [djw|fgk]
enable/disable secondary compression
disable small string-matching compression
disable external decompression (encode/decode)
disable external recompression (decode)
disable checksum (encode/decode)
soft config (encode, undocumented)
-A [apphead]
disable/provide application header (encode)
disable output (check/compute only)
use alternate code table (test)

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/

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

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).

August 2009 Xdelta3