Bash function which helps to print out the RPM dependency tree for a specific package.

rpm_deps_tree.sh

function walk() {
  if [ $1 == 0 ]; then
    echo -n "" > /tmp/deps;
  fi
  echo $2 >> /tmp/deps;
  for N in $(seq $1); do
    echo -n '  ';
  done
  echo -n '- ';
  echo $2;
  DEPS=$(rpm -q --whatrequires $2 | grep -v 'no package' | sort -u | sed 's/-[0-9].*//');
  for D in $DEPS; do
    if [ $(egrep "^$D$" /tmp/deps | wc -l) == "0" ]; then
      walk $(( $1 + 1 )) $D;
    fi
  done
}

walk 0 perl