On Thu, Nov 29, 2007 at 10:35:32AM +1100, Lux Zhang wrote:
> what are tools to split a large file (etc 700mb a.avi) into small
> pieces and then the merger to merge them?
People have suggested 'split' and 'cat'. These are at best marginal, at
worst simply won't work for binary files.
Look for a script called 'bsplit'. If you can't find a distributed version,
something like the attached will work.
Cheers,
--
Dave Ihnat
President, DMINET Consulting, Inc.
dihnat@xxxxxxxxxx
#
# bsplit [n] name
#
# Breaks a file into N-block parts, where a block is 512 bytes
#
# Author: Dave Ihnat. Released as a work in the Public Domain.
BCOUNT=0
FCOUNT=0
BSKIP=0
if [ $# -eq 2 ]
then
BCOUNT=$1;
shift;
else
BCOUNT=100;
fi;
OUTFILE=$1;
PREFIX=00
while [ TRUE ]
do
echo "$OUTFILE.${PREFIX}${FCOUNT}"
# dd of=$OUTFILE.${PREFIX}${FCOUNT} skip=$BSKIP count=$BCOUNT
dd of=$OUTFILE.${PREFIX}${FCOUNT} count=$BCOUNT
if [ $? -ne 0 ]
then
break;
fi;
if [ ! -s $OUTFILE.${PREFIX}${FCOUNT} ]
then
rm $OUTFILE.${PREFIX}${FCOUNT}
break;
fi;
FCOUNT=`expr $FCOUNT + 1`
if [ "$FCOUNT" -gt 99 ]
then
PREFIX=""
elif [ "$FCOUNT" -gt 9 ]
then
PREFIX="0"
fi;
BSKIP=`expr $BSKIP + $BCOUNT`
done
exit 0
