Error output of cat to /dev/null


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Error output of cat to /dev/null
# 8  
Old 02-05-2011
Code:
cat /dirA/dirB/temp*.log  > /dirA/dirB/final.log 2>/dev/null && rm /dirA/dirB/temp*.log

Perhaps it is safer to use:
Code:
cat /dirA/dirB/temp*.log  >> /dirA/dirB/final.log 2>/dev/null && rm /dirA/dirB/temp*.log

Otherwise final.log will be overwritten if there are no files...

Quote:
Originally Posted by aix-guy
you could try and send the error of the cat to null
cat /dirA/dirB/temp*.log 2>/dev/null > /dirA/dirB/final.log 2>/dev/null
[..]
The second 2>/dev/null serves no purpose. The order is not important in this case. For example this would work also:
Code:
> /dirA/dirB/final.log 2>/dev/null cat /dirA/dirB/temp*.log && rm /dirA/dirB/temp*.log


Last edited by Scrutinizer; 02-05-2011 at 08:18 AM..
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. 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 (2 Replies)
Discussion started by: firelink
2 Replies

2. 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:... (5 Replies)
Discussion started by: jbmorrisonjr
5 Replies

3. HP-UX

/dev/Null error

Hi Guru's, I am trying to test the network speed or load by this command. but getting error " Not Connected ". Could you guys please help. ftp> put "|dd if=/dev/zero bs=8k count=1000000" /dev/null Not connected. Please use code tags! (9 Replies)
Discussion started by: sris.sun
9 Replies

4. 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 (3 Replies)
Discussion started by: glev2005
3 Replies

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... (4 Replies)
Discussion started by: bakunin
4 Replies

6. UNIX for Dummies Questions & Answers

cp output /dev/null results in not a directory

Hello, I am working on a script to measure the read performance of a busybox environment. The logical choice is to use a command line like: (time cp * /dev/null) 2> /tmp/howlong.txt Ah, the rub is cp or /dev/null will only accept a single file at a time. The result in the txt file is and... (1 Reply)
Discussion started by: stevesmo
1 Replies

7. UNIX for Dummies Questions & Answers

cat /dev/null

Hi, Excuse my ignorance here - I'm a networks man and my knowledge of all things unix is somewhat limited. We have a very large file (/var/tmp/mond.log) that we need to zero - does the "cat /dev/null > /var/tmp/mond.log" command achieve this? (4 Replies)
Discussion started by: freakydancer
4 Replies

8. 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 ?? (12 Replies)
Discussion started by: civic2005
12 Replies

9. 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? (1 Reply)
Discussion started by: frustrated1
1 Replies

10. Shell Programming and Scripting

error piping nohup to /dev/null

Hi, I have a script as follows: #!/bin/sh nohup ./my_program >& /dev/null & However, i get a "Generated or received a file descriptor number that is not valid" whenever I run it. running the command up in prompt is ok though. if i change the first line to #!/bin/csh i get a then:... (4 Replies)
Discussion started by: mochi
4 Replies
Login or Register to Ask a Question