xdelta3 (1) Linux Manual Page
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
-F- force the external-compression subprocess
-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)
-m- arguments for "merge"
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).