Has anyone seen this issue with the /dev/null? Post: 28433

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Q1 :/dev/null Q2 -A

Hi, Q1-What does nroff -ms > /dev/null Q2- What does mean -A under STAT column : ps aux |head -20 UTIL PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND root 516 93,0 0,0 12 12 - A 04 nov 3906:51 wait Thank you.

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> /dev/null

hello all, In many shell scripts i found '> /dev/null' , i am not able to get this, will any one please explain why we are using this. thanks sudha

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Hi expert, May I know what is the difference between below cron tab entry ? 0,12 * * * * /abc/myscript.sh > /dev/null 2>&1 0,12 * * * * /abc/myscript.sh

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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

7. Shell Programming and Scripting

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

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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Help with /dev/null Please

Hello All and a Happy New year to yous guys. I'm running the below command on my AIX box and it keeps giving me the message that the file doesn't exist. I know the file don't exist, but I don't want to see the error. 2>/dev/null doesn't work. bash-3.00$ ls -l C* | wc -l 2>/dev/null ls:...

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/dev/null file issue

Hi Experts, I Have a query. In one of my server I just came to know that there was /dev/null file which is a not a character file. Its just a normal file. I know the command to create the character file (/dev/null) but what is the procedure. Like should i delete /dev/null and create or...

10. Shell Programming and Scripting

2>/dev/null

Friends have the following problem a search may not find anything which would correct example: ls -ltr *prueba.txt | nawk '{ print $9 }' > Procesar.dat 2>/dev/null When he finds nothing gives me the following error ls: prueba.txt: No such file or directory because 2> / dev / null...

LEARN ABOUT MINIX

s_n_d

SET_NET_DEFAULT(8)					      System Manager's Manual						SET_NET_DEFAULT(8)

NAME

       s_n_d, set_net_default - select the default TCP/IP network

SYNOPSIS

       set_net_default: not found

DESCRIPTION

       This  manual page is here because so many others refer to it.  The set_net_default command does not exist under standard Minix, because the
       TCP/IP server only supports one network.  The server under Minix-vmd supports four different networks, that  can  each  be  chosen  as  the
       default network.

       The  TCP/IP library and commands do have a notion about a "default network" however, because the code is shared between the Minix versions.
       So if you want to venture into network programming then you should know about the devices and environment variables mentioned below to make
       your program compatible.  (Especially since there is a plan to upgrade the TCP/IP server for standard Minix.)

   Options and environment to change the default
       Many  TCP/IP  programs implement the following options and environment variables to change the default devices set by set_net_default.  The
       options are only implemented for low level programs where it makes sense to name a network device.  The environment variables are  used	in
       all code.  You can run a process and all its children connected to a different network by setting four environment variables.

       ETH_DEVICE=device
       -E device
	      Device to use as raw ethernet device instead of the default /dev/eth.

       PSIP_DEVICE=device
       -P device
	      Pseudo IP device to use instead of /dev/psip.

       IP_DEVICE=device
       -I device
	      IP device to use instead of /dev/ip.

       TCP_DEVICE=device
       -T device
	      TCP device to use.

       UDP_DEVICE=device
       -U device
	      UDP device to use.

FILES

       /dev/eth[01]	 First and second raw ethernet.

       /dev/psip[01]	 First and second Pseudo IP network.

       /dev/ip[0123]	 IP devices for two ethernets and two Pseudo IP networks.

       /dev/tcp[0123]	 TCP devices for same four networks.

       /dev/udp[0123]	 UDP devices.

       /dev/eth, /dev/psip, /dev/ip, /dev/tcp, /dev/udp
			 Devices  for  the default network, links to the devices above.  Eth is only present if ethernet is the default, psip only
			 for pseudo IP.

SEE ALSO

       ip(4), boot(8).

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																SET_NET_DEFAULT(8)

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What is /dev/tty /dev/null and /dev/console

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