cp output /dev/null results in not a directory Post: 302318548

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1. UNIX for Advanced & Expert Users

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.

2. Solaris

URGENT - setup port and dump all output to /dev/null or a file

Please help urgently. I need to setup up some sort of service on a solaris server on a port. I dont need it do anything special, anything that is sent to this port from an external server should be dump to /dev/null or a flat file.. Can you help urgently?

3. Shell Programming and Scripting

> /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

4. Solaris

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

Hi, Anyone can help My solaris 8 system has the following /dev/null , /dev/tty and /dev/console All permission are lrwxrwxrwx Can this be change to a non-world write ?? any impact ??

5. Ubuntu

tar not reading if output directed to /dev/null

I stumbled across a somewhat strange behavior of tar and find no explanation for it: i was testing a DVD for read errors and thought to simply tar the content and direct the output to /dev/null: tar -cvf - /my/mountpoint/*ts > /dev/null This way i expected the system to read the complete...

6. Shell Programming and Scripting

Error output of cat to /dev/null

Hello, I'm trying to send the error output of a 'cat' operation to /dev/null like this: cat /dirA/dirB/temp*.log > /dirA/dirB/final.log 2>/dev/null This works perfectly in a terminal, but not when placed in a script. If there are no files matching temp*.log the script outputs an error...

7. UNIX for Dummies Questions & Answers

/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

8. 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:...

9. Shell Programming and Scripting

redirect the audio output to /dev/null

I'm using an text-to-speech synthesis in a script, and I need to redirect it's output to /dev/null how can I do that ? And how to redirect the stream to his normal output then （sound card ) ? thankx

10. Shell Programming and Scripting

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:...

LEARN ABOUT BSD

kmem

MEM(4)							     Kernel Interfaces Manual							    MEM(4)

NAME

       mem, kmem - main memory

SYNOPSIS

       major device number(s):
	    raw: 1
       minor device encoding:
	    mem: 0;  kmem: 1;  null: 2

DESCRIPTION

       Mem is a special file that is an image of the main memory of the computer.  It may be used, for example, to examine (and even to patch) the
       system.

       Byte addresses in mem are interpreted as physical memory addresses.  References to non-existent locations cause errors to be returned.

       The file kmem is the same as mem except that kernel virtual memory rather than physical memory is accessed.  Only kernel virtual  addresses
       that  are  mapped to memory are allowed.  Examining and patching device registers is likely to lead to unexpected results when read-only or
       write-only bits are present.

       On PDP-11s, the I/O page begins at location 0160000 of kmem and the per-process data segment for the current process begins at 0140000  and
       is USIZE clicks (64 bytes each) long.

FILES

       /dev/mem
       /dev/kmem
       /dev/MAKEDEV	   script to create special files
       /dev/MAKEDEV.local  script to localize special files

BUGS

       On PDP-11's, specifying an odd kernel or user address, or an odd transfer count is [generally] slower than using all even parameters.

       On machines with ENABLE/34(tm) memory mapping boards the I/O page can be accessed only through kmem.

3rd Berkeley Distribution					 January 28, 1988							    MEM(4)

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Q1 :/dev/null Q2 -A

Discussion started by: big123456

2. Solaris

URGENT - setup port and dump all output to /dev/null or a file

Discussion started by: frustrated1

3. Shell Programming and Scripting

> /dev/null

Discussion started by: rrs

4. Solaris

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

Discussion started by: civic2005