In traditional BSD-style printing on Unix/Linux, which command submits a print job (adds it to the printer queue)?

Introduction / Context:
Legacy printing systems on Unix-like OSes follow the BSD model, where different commands handle submission, status checks, and administration. Recognizing which command queues a job is critical when working with older systems or CUPS in BSD compatibility mode.

Given Data / Assumptions:

• BSD printing commands are available (or CUPS BSD compatibility).
• We need to submit a file to the print queue.
• We are not managing the daemon or querying status.

Concept / Approach:

lpr submits (prints) files. lpd is the line printer daemon. lpq checks the queue status, and lpc provides printer control (start/stop, etc.). On modern systems using CUPS, lpr remains the user-facing submission command in many setups.

Step-by-Step Solution:

Verification / Alternative check:

After running lpr, confirm with lpq or CUPS web UI (http://localhost:631 ) if available. Logs can be checked under /var/log/cups/.

Why Other Options Are Wrong:

• lpd: daemon, not the user submission tool.
• lpq: queue status viewer.
• lpc: line printer control utility.
• None: incorrect because lpr is correct.

Common Pitfalls:

• Confusing System V lp with BSD lpr—both submit jobs in their respective models.
• Forgetting to specify a printer with -P when multiple printers are configured.

Final Answer:

lpr.