xdelta3 (1) - Linux Manuals
xdelta3: VCDIFF (RFC 3284) binary diff tool
NAME
xdelta3 - VCDIFF (RFC 3284) binary diff toolSYNOPSIS
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).