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HP-UX 11i Version 3: February 2007
mknod — create special files
The mknod command creates the following types of files:
name is the path name of the file to be created. The newly created file has a default mode that is readable and writable by all users (0666), but the mode is modified by the current setting of the user's file mode creation mask (see umask(1)).
Character and Block Special Files
Character device special files are used for devices that can transfer single bytes at a time, such as nine-track magnetic tape drives, printers, plotters, disk drives operating in "raw" mode, and terminals. To create a character special file, use the c argument.
Block device special files are used for devices that usually transfer a block of data at a time, such as disk drives. To create a block device special file, use the b argument.
The remaining arguments specify the device that will be accessible through the new special file:
The major and minor values can each be specified in hexadecimal, octal, or decimal, using C language conventions (decimal: no leading zero; octal: leading zero; hexadecimal: leading 0x).
The assignment of major and minor device numbers is specific to each HP-UX system. Refer to the System Administrator manuals supplied with your system for details.
Only users who have appropriate privileges can use mknod to create a character or block device special file.
To create a FIFO (named pipe or buffer) file, use the p argument. You can also use the mkfifo command for this purpose (see mkfifo(1)). All users can use mknod to create FIFO files.
Access Control Lists
In HFS file systems, optional ACL entries can be added to special files and FIFOs with the chacl command (see chacl(1)). In JFS file systems, optional ACL entries can be added to special files and FIFOs with the setacl command (see setacl(1)). However, system programs are likely to silently change or eliminate the optional ACL entries for these files.
HP-UX System Administrator manuals