There are two incorrect concepts in your answer.First is: the redirection happens from left to right. Can Customs make me go back to return my electronic equipment or is it a scam? up vote 27 down vote favorite 3 I have a backup script which I need to run at a particular time of a day so I am using cron for this OR read more like this:BASH Shell Redirect Output and Errors To /dev/nullBASH Shell: How To Redirect stderr To stdout ( redirect stderr to a File )Unix and Linux: Redirect Error Output
monitor) stderr2standard error output stream (usually also on monitor) The terms "monitor" and "keyboard" refer to the same device, the terminal here. Good way to explain fundamental theorem of arithmetic? This is suitable sometimes for cron entries, if you want a command to pass in absolute silence.
rm -f $(find / -name core) &> /dev/nullThis (thinking on the
The syntax is (beside other redirection syntax) described here: http://bash-hackers.org/wiki/doku.php/syntax/redirection#appending_redirected_output_and_error_output share|improve this answer edited Mar 23 '14 at 11:24 Mathias Bynens 73.4k34147195 answered May 18 '09 at 4:42 TheBonsai 6,37731414 3 cmd &>> file.txt did not work for me. Tagged with: > /dev/null 2>&1, cronjobs, I/O redirection, output error messages, redirect stderr to file, redirect stdout to file, standard error, stderr, EasyNext FAQ: FreeBSD: Install bindgraph To Make Graphs About Bash Redirect Stderr To Stdout To File Is 8:00 AM an unreasonable time to meet with my graduate students and post-doc?
Reply Link Hugues November 12, 2013, 4:33 pml often do the following and I do not want an error (just a 0 length file) You get a valid output if the Bash Redirect Output To File And Screen You can even combine sudo to downgrade to a log user account and add date's subject and store it in a default log directory :) Reply Link Alejandro April 22, 2015, And avoid redirection in the command itself. I am the (current, not the original) author of another.
asked 7 years ago viewed 344715 times active 7 months ago Get the weekly newsletter! Bash Redirect Stdout And Stderr To Different Files ls -l 2>&1 >&3 3>&- | grep bad 3>&- # Close fd 3 for 'grep' (but not 'ls'). # ^^^^ ^^^^ exec 3>&- # Now close it for the remainder of How do I store and redirect output from the computer screen to a file on a Linux or Unix-like systems? It's free: ©2000-2016 nixCraft.
Subtraction with a negative result Why write an entire bash script in functions? The "here document" will do what it's supposed to do, and the * will, too. Bash Redirect Output To File Append command >/dev/null 2>&1 See also Internal: Illustrated Redirection Tutorial Internal: The noclobber option Internal: The exec builtin command Internal: Simple commands parsing and execution Internal: Process substitution syntax Internal: Obsolete and Bash Redirect Output To File Within Script ls -yz 2>&1 >> command.log # Outputs an error message, but does not write to file. # More precisely, the command output (in this case, null) #+ writes to the file,
Why write an entire bash script in functions? his comment is here Usage:
How to indicate you are going straight? The order of redirections is important. Tagged with: EasyNext FAQ: FreeBSD: (EE) Failed to load module "fbdev" (module does not exist, 0) Error and SolutionPrevious FAQ: FreeBSD 10: Apply Binary Updates To Keep Base System Up To this contact form Natural construction What type of sequences are escape sequences starting with "\033]" I do not get any ether when mining How could banks with multiple branches work in a world without
more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Bash Redirect Stdout And Stderr To Same File Any file descriptor can be redirected to other file descriptor or file by using operator > or >>(append). The way to go portable (similar to the appending answers) always was and still is >outfile 2>&1 –TheBonsai May 18 '09 at 4:48 add a comment| 6 Answers 6 active oldest
Reply Link Sekkuar September 2, 2013, 7:20 pmIncorrect. command1 | command2 | command3 > output-file See Example 16-31 and Example A-14.Multiple output streams may be redirected to one file. ERRORFILE=script.errors bad_command1 2>$ERRORFILE # Error message sent to $ERRORFILE. Unix Redirect All Output To File Here's what i think about the execution sequence: First, the command ls -l /bin sends its output to stdout and error to stderr(any one of those).
UNIX is a registered trademark of The Open Group. Is there a good way to get from Levoča to Lviv? you want to redirect this descriptor, you just use the number: # this executes the cat-command and redirects its error messages (stderr) to the bit bucket cat some_file.txt 2>/dev/null Whenever you navigate here A little note for seeing this things: with the less command you can view both stdout (which will remain on the buffer) and the stderr that will be printed on the
exec 3<> File # Open "File" and assign fd 3 to it. It will make STDERR point to STDOUT and then change STDOUT to something else (without touching STDERR) Here is a more detailed tutorial covering both those misconceptions http://wiki.bash-hackers.org/howto/redirection_tutorial Reply Link iek bad_command2 2>>$ERRORFILE # Error message appended to $ERRORFILE. Just something to keep in mind.
Connected to 192.168.1.10 (192.168.1.10) -------------------------------------How can I get rid of "Connection closed by foreign host." ? It is sometimes useful to assign one of these additional file descriptors to stdin, stdout, or stderr as a temporary duplicate link.  This simplifies restoration Reply Link Jonathan May 26, 2009, 9:31 pmThanks!