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).