20.How to check the RPM dependency When making custom-made CD etc.,which is necessary to investigate the dependency of the RPM files. It can investigate easily as follows: Premise:The directory with RPM files are /tmp/i386/RedHat/RPMS 　$cd /tmp/i386/RedHat/RPMS Make the directory for test 　$mkdir -p /tmp/testdb Initialize the RPMDB 　$rpm --initdb --dbpath /tmp/testdb Dependency check 　$rpm --test --dbpath /tmp/testdb -Uvh *.rpm The message will be outputted if caught in the check of the dependency, Please add the required RPM files.