What is /dev/tty /dev/null and /dev/console Post: 302155236

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sniff /dev/tty

hello all, Being root, I would like to log user activity (also multiple root activity), i don't really like history file based logging, lets assume that users have access to their .profile. I would like to write a monitoring daemon in C that would capture /dev/ttys, so I need to do a...

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/dev/null 2>&1 Versus /dev/null 2>1

How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&" echo "hello" > /dev/null 2>&1 echo "hello" > /dev/null 2>1

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Reading password from /dev/tty

hi, From the below script: ##########################################pwd_auth.sh######################################################################################## #Author: Pandeeswaran Bhoopathy #Written on:26th Jan 2012 2:00PM #This script describes the feature of stty and illustrates...

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I apologize if this question has been answered else where or is too elementary. I ran across a KSH script (long unimportant story) that does this: if ; then CAS_SRC_LOG="/var/log/cas_src.log 2>&1" else CAS_SRC_LOG="/dev/null 2>&1" fithen does this: /usr/bin/echo "heartbeat:...

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LEARN ABOUT FREEBSD

devfs.conf

DEVFS.CONF(5)						      BSD File Formats Manual						     DEVFS.CONF(5)

NAME

     devfs.conf -- boot-time devfs configuration information

DESCRIPTION

     The devfs.conf file provides an easy way to set ownership and permissions, or create links for devices available at boot.

     It does not work for devices plugged in and out after the system is up and running, e.g. USB devices.  See devfs.rules(5) for setting owner-
     ship and permissions for all device nodes, and devd.conf(5) for actions to be taken when devices are attached or detached.

     Lines starting with a hash sign ('#') and empty lines are ignored.  The lines that specify devfs.conf rules consist of three parameters sepa-
     rated by whitespace:

     action  The action to take for the device.  The action names are only significant to the first unique character.

     devname
	     The name of the device created by devfs(5).

     arg     The argument of the action.

     The actions currently supported are:

     link    This action creates a symbolic link named arg that points to devname, the name of the device created by devfs(5).

     own     This action changes the ownership of devname.  The arg parameter must be in the form of an owner:group pair, in the same format used
	     by chown(8).

     perm    This action changes the permissions of devname.  The arg parameter must be a mode as explained in chmod(1).

FILES

     /etc/devfs.conf
     /usr/share/examples/etc/devfs.conf

EXAMPLES

     To create a /dev/cdrom link that points to the first SCSI(4) CD-ROM, the following may be added to devfs.conf:

	   link    cd0	   cdrom

     Similarly, to link /dev/cdrom to the first ATAPI CD-ROM device, the following action may be used:

	   link    acd0    cdrom

     To set the owner of a device, the own action may be specified:

	   own	   cd0	   root:cdrom

     To set the permissions of a device, a perm action should be used:

	   perm    cd0	   0660

SEE ALSO

     chmod(1), devd.conf(5), devfs(5), devfs.rules(5), chown(8)

AUTHORS

     This manual page was written by Roland Smith <rsmith@xs4all.nl>.

BSD
								   May 17, 2005 							       BSD

10 More Discussions You Might Find Interesting

1. Programming

sniff /dev/tty

Discussion started by: wayward

2. UNIX for Dummies Questions & Answers

/dev/null 2>&1 Versus /dev/null 2>1

Discussion started by: glev2005

3. UNIX for Dummies Questions & Answers

Reading password from /dev/tty

Discussion started by: pandeesh

4. Shell Programming and Scripting

Redirecting standard out to /dev/null goes to file "/dev/null" instead

Discussion started by: jbmorrisonjr