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Full Discussion: Creating a file / /dev/null
Top Forums UNIX for Dummies Questions & Answers Creating a file / /dev/null Post 41840 by norsk hedensk on Wednesday 15th of October 2003 04:58:48 PM
Old 10-15-2003
no, if your actually talking about file contents then this is different. you can redirect output to /dev/null as an example. your console is actually referenced to as a file in unix, same as the printer and everything else. so if you have a program that outputs "hello world" you could, instead of sending it to the console, redirect it to the printer so it prints, or to /dev/null. the out put sent to /dev/null does not get stored in a file, nor does it get output to anywhere. its gone.

your 'cat /dev/null > file' example would just create a file with no data in it what so ever, its size would be zero.
 

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LEARN ABOUT OPENDARWIN

sysmsg

sysmsg(7D)							      Devices								sysmsg(7D)

NAME

       sysmsg - system message routing to console devices

SYNOPSIS

       /dev/sysmsg

DESCRIPTION

       The  file  /dev/sysmsg routes output to a variable set of console devices.  Writes to /dev/sysmsg are always directed to the system console
       /dev/console, and are in addition directed to a set of auxiliary console devices managed by consadm(1M).

       Only root has permission to write to this device.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsr			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Stable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       consadm(1M), syslogd(1M) , attributes(5), console(7D)

SunOS 5.10							    13 Oct 1998 							sysmsg(7D)
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