Path: utzoo!utgpu!water!watmath!clyde!bellcore!decvax!decwrl!sun!sears
From: sears@sun.uucp (Daniel Sears)
Newsgroups: comp.sys.ibm.pc
Subject: Re: MKS: multi-volume backups.
Keywords: tape drives, cpio, dd
Message-ID: <41543@sun.uucp>
Date: 10 Feb 88 19:04:07 GMT
Organization: Sun Microsystems, Inc. - Mtn View, CA
Lines: 72

Here are two scripts that I use to split and reassemble large files (2-10Mb).
Maybe you can modify them for archiving.

This brings me to a related subject.  Floppy disks, even of the 1.2 megabyte
variety, are too small for backup or file transfer of large files.  I would
be interested in hearing from people who use the MKS Toolkit with tape drives
and streamers.

--Dan

#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create:
#	split.ksh
#	unsplit.ksh
# This archive created: Wed Feb 10 11:03:33 1988
export PATH; PATH=/bin:/usr/bin:$PATH
if test -f 'split.ksh'
then
	echo shar: "will not over-write existing file 'split.ksh'"
else
cat << \SHAR_EOF > 'split.ksh'
#
# split.ksh -- split a file into 1Mb chunks with dd(1)
# usage sh split.ksh "input file"
#

chunks=$(ls -l $1 | awk '{ t = int($3/1000000 + 1) ; for(i=1; i<=t; i++) printf("%d ", i) }')

offset=0

for i in $chunks
do
    echo "change diskettes and press <RETURN>"
    read
    dd if=$1 of=a:$i.bak bs=1024 skip=$offset count=1000
    offset=$(echo $offset | awk '{printf("%s", $0 + 1000)}')
done
SHAR_EOF
fi
if test -f 'unsplit.ksh'
then
	echo shar: "will not over-write existing file 'unsplit.ksh'"
else
cat << \SHAR_EOF > 'unsplit.ksh'
#
# unsplit.ksh -- assemble a file from chunks with dd(1)
# usage sh unsplit.ksh "n chunks" "input file"
#

chunks=$(echo $1 | awk '{ for(i=1; i<=$0; i++) printf("%d ", i) }')

offset=0

for i in $chunks
do
    echo "change diskettes and press <RETURN>"
    read
    dd if=a:$i.bak of=$2 bs=1024 seek=$offset count=1000
    offset=$(echo $offset | awk '{printf("%s", $0 + 1000)}')
done
SHAR_EOF
fi
exit 0
#	End of shell archive
-- 
Daniel Sears                Sun Microsystems, Inc.
Technical Publications      MS 5-42
(415) 691-7435              2550 Garcia Avenue
sears@sun.com               Mountain View, CA  94043