Shell脚本解压rpm软件包

#!/bin/sh#*************************************************************#     Author: Unknown, Modified by VeVB.COm#    Filename: rpmextract.sh#  Description: extrac rpm package without install #         rpm related program#*************************************************************if [ $# -lt 1 ] ; then	echo -e "anUsage: `basename $0` <rpm_pkg_file> n"	exit 1fipkg=$1if [ ! -e "$pkg" ]; then  echo -e "nERR: package $pkg does not exist ! n"	exit 1fi### check if cpio existsCPIO_VER=`cpio --version 2>/dev/null`if [ -z "$CPIO_VER" ]; then	echo -e "nERR: prerequisite program cpio does not found ! n"	exit 1fileadsize=96o=`expr $leadsize + 8`set `od -j $o -N 8 -t u1 $pkg`il=`expr 256 * ( 256 * ( 256 * $2 + $3 ) + $4 ) + $5`dl=`expr 256 * ( 256 * ( 256 * $6 + $7 ) + $8 ) + $9`# echo "sig il: $il dl: $dl"sigsize=`expr 8 + 16 * $il + $dl`o=`expr $o + $sigsize + ( 8 - ( $sigsize % 8 ) ) % 8 + 8`set `od -j $o -N 8 -t u1 $pkg`il=`expr 256 * ( 256 * ( 256 * $2 + $3 ) + $4 ) + $5`dl=`expr 256 * ( 256 * ( 256 * $6 + $7 ) + $8 ) + $9`# echo "hdr il: $il dl: $dl"hdrsize=`expr 8 + 16 * $il + $dl`o=`expr $o + $hdrsize`dd if=$pkg ibs=$o skip=1 2>/dev/null | gunzip | cpio -idmuv || dd if=$pkg ibs=$o skip=1 2>/dev/null | bzip2 -d | cpio -idmuv