这个脚本有问题，求会linux脚本的朋友帮修改一下哈：

这个脚本是linux上面做一个文件系统的，我在UML官网下的，有问题如下：

[root@zhoutianzuo azuo]# bash install_fs.sh 
Filesystem already created
Filesystem already mounted
going to fetch
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.

源脚本如下：

#!/bin/bash
# Settings !!!*** PLEASE MODIFY THESE ***!!!
export ARCH="i386"
export MIRROR="http://centos.ustc.edu.cn/centos/6.3/os/i386/Packages/"
export TMPDIR=`pwd`"/tmp"
export ROOT_FS=`pwd`"/CentOS6-x86-root_fs"
export RPM_DIR=`pwd`"/RPMS"
export CHROOTCMD="linux32 chroot"
export RPMCMD="rpm"
export PACKAGES="packages.$ARCH"
export ARCHES="$ARCH i686 noarch"
export DEBUG=""
export DUPES=""
export TEXT_BROWSER="lynx"


function doGetRPM() {
	rpmfile=""
	if [ ! -z "$DEBUG" ]; then
		echo "grep $1 $PACKAGES | grep $2 | wc -l"
	fi
	rpmfilescount=`grep ^$1 $PACKAGES | grep $2 | wc -l`
	#echo "filecount=$rpmfilescount"
	if [ "$rpmfilescount" -eq 0 ]; then
		if [ ! -z "$DEBUG" ]; then
			echo "No RPMs found for $1 - $2"
		fi
	else
		if [ "$rpmfilescount" == "1" ]; then
			# echo "Found "`$grep`
			rpmfile=`grep ^$1 $PACKAGES | grep $2`
		else
			if [ ! -z "$DEBUG" ]; then
				echo "Too many packages matching $1: $rpmfilescount"
			fi
			rpmfile=`grep ^$1 $PACKAGES | grep $2 | sort | head -n 1`
		fi
	fi
}
function getRPM() {
	for arch in $ARCHES; do
		doGetRPM $1- $arch
		if [ ! -z "$rpmfile" ]; then
			return
		fi
	done
	for arch in $ARCHES; do
		doGetRPM $1 $arch
		if [ ! -z "$rpmfile" ]; then
			return
		fi
	done
	echo "No RPM package found for $1"
	exit 1
}

function fetch() {
	base=$1
	getRPM $base
	local=$RPM_DIR"/$rpmfile"
	echo "fetch() base=$base, local=$local, rpmfile=$rpmfile"
	if [ ! -e "$local" ]; then
		echo "Downloading $base ($rpmfile)"
		wget -c -O $local "$MIRROR$rpmfile"
	fi
}

function rpminstall() {
	base=$1
	fetch $base
	stripped=`echo $base | sed 's+\.noarch++g' | sed 's+\.$ARCH++g'`
	exists="0"
	if [ ! -z "$DUPES" ]; then
		exists=`$RPMCMD -qa --root $TMPDIR | grep $stripped | wc -l`
	fi
	if [ "$exists" -ne "0" ]; then
		echo "skipped: $stripped"
	else
		$RPMCMD -Uvh --root $TMPDIR $local
		rm -fr $TMPDIR/var/lib/rpm/__db*
	fi
}
function rpminstallgroup() {
	echo "SIZE="$#
	list=""
	while [ $# -ne 0  ]
	do
		package=$1
		fetch $package

		stripped=`echo $1 | sed 's+\.noarch++g' | sed 's+\.$ARCH++g'`
		exists="0"
		if [ ! -z "$DUPES" ]; then
			exists=`$RPMCMD -qa --root $TMPDIR | grep $stripped | wc -l`
		fi
		if [ "$exists" -ne "0" ]; then
			echo "skipped: $stripped"
		else
			list="$list $local"
		fi
		shift
	done
	# echo	"installing list=$list"
	# echo "installcommand=$RPMCMD -ivh --root $TMPDIR $list"
	$RPMCMD -Uvh --root $TMPDIR $list
	rm -fr $TMPDIR/var/lib/rpm/__db*
}


# Making the filesystem
if [ ! -e "$ROOT_FS" ]; then
	dd if=/dev/zero of=$ROOT_FS bs=1024 count=1 seek=1572864
	mkfs.ext4 -L ROOT -F $ROOT_FS
else
	echo "Filesystem already created"
fi
if [ ! -e "$TMPDIR" ]; then
	mkdir $TMPDIR
	mount -o loop $ROOT_FS $TMPDIR
else
	echo "Filesystem already mounted"
fi
mkdir -p $RPM_DIR
#rpm bug?
mkdir -p $TMPDIR/var/lock/rpm
mkdir -p $TMPDIR/var/lib/rpm

if [ ! -e "$TMPDIR/var/lib/rpm" ]; then
	echo "initrpm:"
	echo "$RPMCMD --initdb --root $TMPDIR"
	$RPMCMD --initdb --root $TMPDIR
	rm -fr $TMPDIR/var/lib/rpm/__db*
fi
if [ ! -e "$TMPDIR/dev" ]; then
	mkdir $TMPDIR/dev
	mknod $TMPDIR/dev/null c 1 3
fi

#Get the list of packages
if [ ! -f $PACKAGES ]; then
    if [ -x "`which ${TEXT_BROWSER}`" ]; then
	${TEXT_BROWSER} -dump $MIRROR |grep rpm\$ |awk -F "CentOS/" '{print $2}' >$PACKAGES
    else
	echo "error :$PACKAGES does not exists, and I could not build it with ${TEXT_BROWSER}"
	echo "errot :$PACKAGES should contain a list of all rpms on your mirror site"
	exit 1
    fi
fi

echo "going to fetch"
# pretend to have a kernel (we don't need one):
KERNEL=`grep kernel-2.6 $PACKAGES`
fetch $KERNEL
$RPMCMD -Uvh --justdb --force --nodeps --root $TMPDIR $local
rm -fr $TMPDIR/var/lib/rpm/__db*

mkdir -p $TMPDIR/etc
# create an /etc/fstab
echo "LABEL=ROOT      /               auto    defaults                1   1" >>$TMPDIR/etc/fstab
echo "none            /dev/pts        devpts  gid=5,mode=620          0   0" >>$TMPDIR/etc/fstab
echo "none            /proc           proc    defaults                0   0" >>$TMPDIR/etc/fstab
echo "tmpfs           /tmp            tmpfs   defaults,size=768M      0   0" >>$TMPDIR/etc/fstab

mkdir -p $TMPDIR/usr/kerberos

# Installing the base packages
# no deps for these - got problems otherwise...
packages="glibc-common glibc libsepol pam passwd usermode setup filesystem basesystem util-linux libgcc tzdata compat-libtermcap zlib zip man-pages bash ncurses info gawk vim-common libattr libacl libstdc++ pcre grep cracklib-dicts glib2 centos-release chkconfig sed iputils rootfiles ethtool audit-libs popt libsysfs sysfsutils cpio less gzip readline tar db4 iproute mingetty libselinux libsemanage sysvinit binutils module-init-tools hwdata logrotate rsyslog udev procps diffutils libcap vim-minimal findutils device-mapper e2fsprogs-libs e2fsprogs net-tools shadow libudev device-mapper-libs lvm2-libs lvm2 MAKEDEV psmisc bzip2-libs libxml crypto-utils expat sqlite tcp_wrappers gdbm coreutils-libs gmp coreutils cracklib python openssl libgssglue krb5-libs libselinux-python initscripts db4 glibc-headers audit-libs-python policycoreutils libselinux-python ustr libsemanage bzip2 dash kbd dracut dmraid nss-softokn nss fipscheck python-iniparse"
for package in $packages; do
	fetch $package
	$RPMCMD -Uvh --force --noscripts --nodeps --root $TMPDIR $local
	rm -fr $TMPDIR/var/lib/rpm/__db*
done
mkdir $TMPDIR/etc/profile.d

$CHROOTCMD $TMPDIR useradd rpm
packages="rpm rpm-libs"
for package in $packages; do
	fetch $package
	$RPMCMD -Uvh --force --nodigests --noscripts --nodeps --root $TMPDIR $local
	rm -fr $TMPDIR/var/lib/rpm/__db*
done

# some extras
packages="which nspr python-libs libidn libssh2 cyrus-sasl-lib openldap nss-util nss-softokn-freebl libcom_err libcurl curl python-pycurl ca-certificates dbus-libs pakchois libgpg-error libgcrypt libtasn1 gnutls xz-libs python-iniparse keyutils-libs crontabs cronie cronie-anacron krb5-libs m2crypto python-urlgrabber elfutils-libelf elfutils-libs elfutils fipscheck-lib openssh ncurses-base ncurses-libs libedit openssh-clients tcp_wrappers-libs tcp_wrappers openssh-server wget elfutils lua file-libs file dhcp db4 db4-utils  libffi libusb- libuser libblkid libuuid libcgroup "
for package in $packages; do
	rpminstall $package
done
rpminstallgroup libproxy libproxy-bin libproxy-python
rpminstallgroup rpm rpm-libs
for package in pth pinentry gnupg2 gpgme pygpgme neon rpm-python yum-metadata-parser; do
	rpminstall $package
done
rpminstallgroup yum-[0-9] yum-plugin-fastestmirror
for package in yum-plugin-keys yum-plugin-post-transaction-actions yum-plugin-protectbase yum-utils; do
	rpminstall $package
done
echo "cleaning rpm db"

# re-install yum/rpm from inside...
mount -t proc none $TMPDIR/proc
cp /etc/resolv.conf $TMPDIR/etc

rm -f $TMPDIR/var/lib/rpm/*
#rm -f $TMPDIR/var/lib/rpm/__db*
#for db in Group Requirename Obsoletename Sigmd5 Sha1header Triggername Conflictname Basenames Requirename; do
#	rm -fr $TMPDIR/var/lib/rpm/${db}
#done
rm -fr $TMPDIR/var/cache/yum
$CHROOTCMD $TMPDIR rpm --rebuilddb
fetch centos-release
cp $local $TMPDIR/
$CHROOTCMD $TMPDIR rpm -Uvh --nofiledigest --nodigest --nosignature --force /centos-release*rpm
rm $TMPDIR/centos-release*rpm
$CHROOTCMD $TMPDIR rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
$CHROOTCMD $TMPDIR rpm --import /etc/pki/rpm-gpg/*
mkdir -p $TMPDIR/var/cache/yum/$ARCH/6/base/packages/
cp RPMS/*rpm $TMPDIR/var/cache/yum/$ARCH/6/base/packages/
mkdir -p $TMPDIR/var/cache/yum/$ARCH/6/updates/packages/
cp RPMS/*rpm $TMPDIR/var/cache/yum/$ARCH/6/updates/packages/
#$CHROOTCMD $TMPDIR yum reinstall --releasever=6 -y --nogpgcheck centos-release
#$CHROOTCMD $TMPDIR rpm --import /etc/pki/rpm-gpg/*
$CHROOTCMD $TMPDIR yum install -y yum basesystem
#$CHROOTCMD $TMPDIR yum install --releasever=6 -y --nogpgcheck yum basesystem
#$CHROOTCMD $TMPDIR rpm --import /etc/pki/rpm-gpg/*
$CHROOTCMD $TMPDIR yum install -y openssh-server openssh-clients
$CHROOTCMD $TMPDIR yum update
rm -fr $TMPDIR/var/cache/yum

# ldconfig the newly installed libraries
ldconfig -r $TMPDIR

# create the ubd devices
if [ ! -e "$TMPDIR/dev/ubda" ]; then
	if [ -e "$TMPDIR/dev" ]; then
		for ((i=0; i<8; i++))
		do
			let=$(echo $i|tr '0-7' 'a-z')
			mknod $TMPDIR/dev/ubd$let b 98 $[16 * $i]
			for ((p=1; p<=16; p++)) do
				mknod $TMPDIR/dev/ubd$let$p b 98 $[16 * $i + $p]
			done
		done
	else
		echo "/dev not found!"
		exit 1
	fi
fi
# basic devices so we can boot without an initrd:
cp -avpr /dev/console /dev/null /dev/zero $TMPDIR/dev
mkdir $TMPDIR/dev/pts

# use yum to update the system
echo "/dev/ROOT	/ ext4 rw 0 0" > $TMPDIR/etc/mtab

# tweak the inittab to only use tty0 and add it to securetty
for cf in /etc/init/start-ttys.conf /etc/sysconfig/init; do
	mv $cf $cf.bak
	cat $cf.bak | sed 's/1-6/0/g' > $cf
	rm $cf.bak
done
echo "tty0" >> /etc/securetty

#enable shadow passwords
$CHROOTCMD $TMPDIR pwconv

#Remove the root password
sed -i -e "s/^root:\*:/root::/" $TMPDIR/etc/shadow

# We need an /etc/hosts file!
echo "127.0.0.1		localhost	localhost.localdomain" > $TMPDIR/etc/hosts

# make the first network interface start with dhcp
# Use ifcfg-eth0 from currrent directory if we have it, otherwise create
$CHROOTCMD $TMPDIR yum install -y dhclient
if [ ! -f "ifcfg-eth0" ]; then
    echo "DEVICE=eth0" >> $TMPDIR/ifcfg-eth0
    echo "BOOTPROTO=dhcp" >> $TMPDIR/ifcfg-eth0
    echo "ONBOOT=yes" >> $TMPDIR/ifcfg-eth0
else
    cp "ifcfg-eth0"  $TMPDIR/ifcfg-eth0
fi
cp $TMPDIR/ifcfg-eth0 $TMPDIR/etc/sysconfig/networking/devices/ifcfg-eth0
cp $TMPDIR/ifcfg-eth0 $TMPDIR/etc/sysconfig/networking/profiles/default/ifcfg-eth0
mv $TMPDIR/ifcfg-eth0 $TMPDIR/etc/sysconfig/network-scripts/ifcfg-eth0
echo "NETWORKING=yes" > $TMPDIR/etc/sysconfig/network
echo "HOSTNAME=localhost.localdomain" >> $TMPDIR/etc/sysconfig/network

echo "" > $TMPDIR/etc/resolv.conf

# clear rest of image
dd if=/dev/zero of=$TMPDIR/blank >& /dev/null
sync
rm $TMPDIR/blank

umount $TMPDIR/proc
umount $TMPDIR
rmdir $TMPDIR
echo "Done!"