RHCE Package Management and Software Installation 3

Question 1

Which command displays a list of past DNF transactions including installs, updates, and removals?

Accepted Answer

dnf history list

Answer

'dnf history list' shows a numbered list of all past DNF transactions with dates, actions, and user information.

Question 2

How do you temporarily disable the repository with ID 'epel' for a single DNF command?

Accepted Answer

dnf install pkg --disablerepo=epel

Answer

The '--disablerepo=<repoid>' flag disables a specific repository only for the duration of that single command.

Question 3

Which RPM command extracts files from an RPM package without installing it (similar to extracting a tar archive)?

Accepted Answer

rpm2cpio package.rpm | cpio -idmv

Answer

'rpm2cpio' converts an RPM to a cpio archive, which 'cpio -idmv' then extracts, allowing file recovery without installation.

Question 4

How do you check whether a downloaded RPM file's signature is valid before installing it?

Accepted Answer

Both B and C are correct

Answer

Both 'rpm --checksig' and its equivalent short form 'rpm -K' verify the GPG signature and MD5 checksum of an RPM file.

Question 5

Which command updates all installed packages to their latest available versions in RHEL?

Accepted Answer

Both B and C are correct

Answer

In RHEL/DNF, 'dnf update' and 'dnf upgrade' are aliases that both update all installed packages to their latest versions.

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