Echo dependencies of an installed rpm package over Linux bash shell

Script:

#!/bin/bash# File: rpmdeps.sh#set -xRTVAL=0; export RTVALcd `dirname $0`WORKDIR=$PWD; export WORKDIRtest ! -z "$1" || {    echo "Error, RPM name is required."    exit 1}TMPFILE=`mktemp /tmp/known_rpms.XXXXXX` || {    echo "Error, $TMPFILE can't be generated."    exit 1}export TMPFILEecho "temp file: '$TMPFILE'"rpmdeps(){    rpm_name_current=$1    # return if current is not a rpm name    rpm -q "$rpm_name_current" >/dev/null || {        return 1;    }    grep "$rpm_name_current" $TMPFILE >/dev/null && {        return 0;    }    echo "$rpm_name_current" | tee -a $TMPFILE    for rpmname in $(rpm -qR $rpm_name_current | grep -v '([^()]*)' | grep -o '^[^<>= /]*' | tr '\n' '\t'); do        rpmdeps $rpmname    done    return 0}rpmdeps "$1" || {    echo "rpm $1 is not exists."    RTVAL=1}rm -f $TMPFILEexit $RTVAL

Usage:

$ ./rpmdeps.sh <rpmname>