/dev/null과 Redirection

[http://linux.about.com/cs/linux101/g/slshdevslshnull.htm]

Definition: /dev/null

On UNIX, this is a virtual-file that can be written to. Data written to this file gets discarded.

It is similar to the file call NUL on Windows machines.

Key point: When rooting a machine, intruders will often redirect logging to /dev/null For example, the command ln -s /dev/null .bash_history will cause the system to stop logging bash commands.

Culture: In the vernacular, means much the same thing as black hole. Typical usage: if you don't like what I have to say, please direct your comments to /dev/null.

/dev/null

1>/dev/null과 동일하다.

1>/dev/null

STDOUT(Standard Output)을 /dev/null로 redirection한다.

2>/dev/null

STDERR(Standard Error)을 /dev/null로 redirection한다.

2>&1

STDERR을 STDOUT으로 redirection