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<HTML
><HEAD
><TITLE
>The MAKEDEV Script</TITLE
><META
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TITLE="The Linux System Administrator's Guide"
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TITLE="Device Files"
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>The Linux System Administrator's Guide: </TH
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><A
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>Chapter 5. Device Files</TD
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><A
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><HR
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><DIV
CLASS="sect1"
><H1
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><A
NAME="AEN800"
></A
>5.1. The <B
CLASS="command"
>MAKEDEV</B
> Script</H1
><P
>Most device files will already be created and will be there
ready to use after you install your Linux system. If by some chance
you need to create one which is not provided then you should first
try to use the <B
CLASS="command"
>MAKEDEV</B
> script. This script is
usually located in <TT
CLASS="filename"
>/dev/MAKEDEV</TT
> but might also
have a copy (or a symbolic link) in
<TT
CLASS="filename"
>/sbin/MAKEDEV</TT
>. If it turns out not to be in
your path then you will need to specify the path to it
explicitly.</P
><P
>In general the command is used as:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <TT
CLASS="prompt"
>#</TT
> <TT
CLASS="userinput"
><B
>/dev/MAKEDEV -v ttyS0</B
></TT
>
<TT
CLASS="computeroutput"
>create ttyS0 c 4 64 root:dialout 0660</TT
>
</PRE
></FONT
></TD
></TR
></TABLE
>
This will create the device file <TT
CLASS="filename"
>/dev/ttyS0</TT
>
with major node 4 and minor node 64 as a character device with
access permissions 0660 with owner root and group dialout.</P
><P
><TT
CLASS="filename"
>ttyS0</TT
> is a serial port. The major and
minor node numbers are numbers understood by the kernel. The kernel
refers to hardware devices as numbers, this would be very difficult
for us to remember, so we use filenames. Access permissions of 0660
means read and write permission for the owner (root in this case)
and read and write permission for members of the group (dialout in
this case) with no access for anyone else.</P
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> command</TD
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