{"results":[{"id":"bash-command-substitution","text":"Command substitution $(command) captures command stdout for use in variable assignments, conditionals, and loops. Preferred over backtick syntax. Can be nested.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"bootc-key-commands","text":"Key bootc commands: `bootc install to-disk`, `bootc switch`, `bootc upgrade`, `bootc status`.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"bpftool-feature-command","text":"`bpftool feature` enumerates all BPF features (program types, map types, helpers, kernel config) supported by the running RHEL kernel.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"chcat-manages-mcs-categories","text":"The `chcat` command manages MCS categories on both users (`chcat -l`) and files; `chcat -L` lists category labels.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"dnf-builddep-installs-build-dependencies","text":"The command `dnf builddep <spec>` installs build dependencies listed in an RPM spec file.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"grubby-set-default-changes-boot-kernel","text":"`grubby --set-default` is the command to change the default boot kernel on RHEL 9.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"idm-kerberos-commands-kinit-klist-kdestroy","text":"IdM Kerberos authentication uses `kinit` to obtain tickets, `klist` to verify current tickets, and `kdestroy` to remove tickets.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"idm-vault-archive-retrieve-commands","text":"`ipa vault-archive` stores data in an IdM vault; `ipa vault-retrieve` retrieves it.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"image-builder-osbuild-composer","text":"RHEL Image Builder uses `osbuild-composer` as the backend service and `composer-cli` as the command-line interface, enabled via `osbuild-composer.socket`.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"image-builder-osbuild-composer-backend","text":"`osbuild-composer` is the backend service for RHEL Image Builder and `composer-cli` is its command-line interface","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"inst-ksstrict-turns-warnings-to-errors","text":"The `inst.ksstrict` boot option turns deprecated Kickstart command warnings into errors.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"inst-sshd-enables-ssh-during-install","text":"`inst.sshd` enables SSH access during installation; on IBM Z it is auto-started by default; root has no password unless set via `sshpw` Kickstart command.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"io-redirection-operators","text":"I/O redirection uses > (overwrite stdout to file), >> (append), 2> (redirect stderr), &> (redirect both stdout and stderr), | (pipe between commands), and < (stdin from file).","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"io-redirection-stdin-stdout-stderr","text":"Use input-output redirection to control where command output goes: > overwrites file, >> appends, 2> redirects stderr, &> redirects both stdout and stderr, | pipes output to another command, < reads stdin from file.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"ipa-healthcheck-package-and-command","text":"The `ipa-healthcheck` utility is installed via `dnf install ipa-healthcheck` and runs on IdM server/replica nodes (not clients).","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"kickstart-default-completion-halt","text":"The default Kickstart completion method is `halt` (equivalent to `shutdown -H`) if no completion command is specified.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"kickstart-harddrive-supported-filesystems","text":"The `harddrive` Kickstart command supports `ext2`, `ext3`, `ext4`, `vfat`, and `xfs` filesystems for the installation source partition.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"kickstart-install-command-removed-rhel9","text":"The `install` Kickstart command has been removed in RHEL 9; installation source commands (`cdrom`, `url`, `nfs`, etc.) are used directly.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"kickstart-logging-tcp-only-port-514","text":"Kickstart `logging` command for remote syslog uses TCP only, with default port 514.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null},{"id":"kickstart-rhsm-direct-cdn-registration","text":"The `rhsm` Kickstart command allows registering and installing directly from the Red Hat CDN without needing `%post` scripts.","truth_value":"IN","justification_count":0,"dependent_count":0,"challenges":[],"last_reviewed":null,"review_result":null}],"count":54,"limit":20,"offset":0}