Worked on the yuwata/systemd repository to enhance the usability of journalctl by implementing improved Bash completion for short option groups. Focused on shell scripting and command line tool development, the contribution introduced partial option completion, allowing users to complete grouped short options such as -efu to -u, streamlining command entry for system administrators. The technical approach involved targeted changes to the Bash completion logic, ensuring minimal disruption to existing workflows while addressing a longstanding user experience gap. This work leveraged Bash and shell scripting expertise to deliver a focused feature that makes systemd tooling more efficient and predictable for daily operations.