99 lines
2.1 KiB
Plaintext
99 lines
2.1 KiB
Plaintext
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#!/bin/sh
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#
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# Untar a file safely by making backup of the files your are about to
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# overwrite.
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#
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# 1994 (c) Regents of McGill University, School of Computer Science.
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# by Luc Boulianne (lucb@cs.mcgill.ca)
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#
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usage () {
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echo "Usage $0 [-v] [-d directory] tarfile.gz"
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echo "Untar files safely by making backup of the files you"
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echo "are about to overwrite."
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echo "options: "
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echo " [-d] cd to this directory before untarring"
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echo " [-v] set debugging on"
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echo " [-h] this help info"
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echo ""
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exit 2
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}
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# parse the command line arguments:
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#
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while [ $# -gt 1 ] ; do
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case $1 in
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-d) shift; directory=$1;;
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-v) debug="y" ;;
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-h) usage;; # call the usage funtion
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*) # Catch anything that doesn't match the
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# previous flags
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echo "Unknown option [$1]";
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usage;;
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esac
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shift
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done
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umask 000
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MV=/bin/mv
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TAR=tar
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GZIP=gzip
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MIDX=9;
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# For solaris ...
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PATH=/usr/ucb:$PATH
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echo "Untarring $1 in the ${directory:=.} directory.";
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index()
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{
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i=1;
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while [ $i -le ${1:-$MIDX} ] ; do
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echo -n "$i ";
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i=`expr $i + 1`;
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done
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}
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rindex()
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{
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i=${1:-$MIDX};
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while [ $i -gt 0 ] ; do
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echo -n "$i ";
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i=`expr $i - 1`;
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done
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}
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rotate()
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{
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fn=$1;shift;
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for n in $* ; do
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src=$fn.`expr $n - 1`
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dest=$fn.$n
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test -f $src && $MV -f $src $dest && echo " - $MV -f $src $dest"
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done
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test -f $fn && $MV -f $fn $fn.0 && echo " - $MV -f $fn $fn.0"
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}
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idx=`rindex`;
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if [ x${debug:-x} = yx ] ; then
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set -x;
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fi
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echo ""
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echo "Uncompressing the tar file - this will take a moment..."
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echo ""
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echo "Note: Please do not interrupt while files are being rotated."
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echo " The simple script, \`unrotate' has been supplied to unrotate files in"
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echo " a given directory, should something go wrong."
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echo ""
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$GZIP -d < $1 | $TAR -tf - | while read file
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do
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cd $directory
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echo $file
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test -f $file && rotate $file $idx && echo "Rotated old file $file"
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done
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$GZIP -d < $1 | (cd $directory ; $TAR -xvpf - )
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