Comandos de la terminal/mknod

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mknod

[rrc@Llawyr ~]$ mknod --help
Usage: mknod [OPTION]... NAME TYPE [MAJOR MINOR]
Create the special file NAME of the given TYPE.

Mandatory arguments to long options are mandatory for short options too.
  -m, --mode=MODE    set file permission bits to MODE, not a=rw - umask
  -Z, --context=CTX  set the SELinux security context of NAME to CTX
      --help     display this help and exit
      --version  output version information and exit

Both MAJOR and MINOR must be specified when TYPE is b, c, or u, and they
must be omitted when TYPE is p.  If MAJOR or MINOR begins with 0x or 0X,
it is interpreted as hexadecimal; otherwise, if it begins with 0, as octal;
otherwise, as decimal.  TYPE may be:

  b      create a block (buffered) special file
  c, u   create a character (unbuffered) special file
  p      create a FIFO

NOTE: your shell may have its own version of mknod, which usually supersedes
the version described here.  Please refer to your shell's documentation
for details about the options it supports.

Report mknod bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'mknod invocation'

[rrc@Llawyr ~]$ mknod --version
mknod (GNU coreutils) 8.21
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David MacKenzie.

[root@Llawyr ~]# cd /usr/src/kernel-3.12.25-3.mga4/Documentation/
[root@Llawyr Documentation]# vi devices.txt 

[rrc@Llawyr src]$ ls -al /dev/sda*
brw-rw---- 1 root disk 8, 0 Aug  7 06:38 /dev/sda
brw-rw---- 1 root disk 8, 1 Aug  7 06:38 /dev/sda1
brw-rw---- 1 root disk 8, 2 Aug  7 06:38 /dev/sda2
brw-rw---- 1 root disk 8, 3 Aug  7 06:38 /dev/sda3

[root@Llawyr ComandosDeLaTerminal]# ls -al /dev/sr0
brw-rw----+ 1 root cdrom 11, 0 Aug  7 08:12 /dev/sr0

[root@Llawyr ComandosDeLaTerminal]# mknod sr0 b 11 0

[root@Llawyr ComandosDeLaTerminal]# ls -al sr0
brw-r--r-- 1 root root 11, 0 Aug  7 08:38 sr0

[root@Llawyr ComandosDeLaTerminal]# chmod 660 sr0

[root@Llawyr ComandosDeLaTerminal]# chown root:cdrom sr0

[root@Llawyr ComandosDeLaTerminal]# eject sr0

[root@Llawyr ComandosDeLaTerminal]# eject sr1
eject: sr1: not found mountpoint or device with the given name