MPE/iX System Utilities Reference Manual (32650-90908)

Chapter 14
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14 MKNOD
The MKNOD utility lets you create device link files, streams files, and fifo files.
The security restrictions enforced with MKNOD are as follows:
To create a streams file, you must have either SM or NM capability.
To create a device link file, you must have SM capability.
To create a fifo device file, you must CD access to the directory in which you're creating the file.