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The daemon runs on port 515/tcp and can be accessed using the `lpr`command. To print, the client sends a **control file** defining job/username and a **data file** containing the actual data to be printed. The **input type** of the data file can be set in the control file by choosing among **various file formats**. However it is up to the LPD implementation how to actually handle the print data. A popular LPD implementation for Unix-like operating system is LPRng. LPD can be used as a carrier to deploy **malicious PostScript** or **PJL print jobs**.
The `lpdprint` and `lpdtest` tools are included in [**PRET**](https://github.com/RUB-NDS/PRET)**.** They are a minimalist way to print data directly to an LPD capable printer or download/upload/delete files and more:
<summary><strong>Support HackTricks and get benefits!</strong></summary>
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