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Bash Error Message Redirect


To the author of the original post, It depends what you need to achieve. E.g. I am aware of <() and $() process and command substitution respectively but not of {}. –ronnie Oct 20 '12 at 6:54 add a comment| Your Answer draft saved draft There are two incorrect concepts in your answer.First is: the redirection happens from left to right. http://onlinetvsoftware.net/bash-redirect/bash-redirect-error-message-to-variable.php

Basically you can: redirect stdout to a file redirect stderr to a file redirect stdout to a stderr redirect stderr to a stdout redirect stderr and stdout to a file redirect Hehe... This is suitable sometimes for cron entries, if you want a command to pass in absolute silence.

 rm -f $(find / -name core) &> /dev/null 
This (thinking on the If N is omitted, stdout is assumed (FD 1).

Bash Error Redirection Null

Thankyou! If not, why? If you write date= $(date) 2>/dev/null, the “command not found” message comes from the shell, not from the command whose error stream is redirected.

Adopt A Jet/Book How rich can one single time travelling person actually become? I upvoted the accepted answer :) –Costi Ciudatu May 25 '14 at 19:10 2 &> now works as expected on OS X 10.11.1 (seems to be bash 3.2), just for Is it? –Salman Abbas Jul 11 '12 at 1:10 7 According to wiki.bash-hackers.org/scripting/obsolete, it seems to be obsolete in the sense that it is not part of POSIX, but the Bash Redirect Error To Variable Is the empty set homeomorphic to itself?

Reply Link Security: Are you a robot or human?Please enable JavaScript to submit this form.Cancel replyLeave a Comment Name Email Comment You can use these HTML tags and attributes: Bash Error Output Redirect Search for "shell redirection" for more details. –Mat Mar 17 at 5:04 add a comment| Did you find this question interesting? Any idea why? –Alexandre Holden Daly May 30 '14 at 12:12 1 Note that (by default) this has the side-effect that $? in the first example you wrote: exec 1<>$LOG_FILE .

I was searching how resolve this problem, and your solution work perfect for me! Bash Redirect Error Output To /dev/null Relatively easy: initially, stdout points to your terminal (you read it) same applies to stderr, it's connected to your terminal 2>&1 redirects stderr away from the terminal to the target for How to book a flight if my passport doesn't state my gender? The reason is unknown, but it seems to be done on purpose.

Bash Error Output Redirect

Changing to >&3 may help. –quizac Sep 23 '14 at 17:40 add a comment| up vote 1 down vote For tcsh, I have to use the following command : command >& bash share|improve this question edited Jul 25 '13 at 18:30 doubleDown 4,3131429 asked Mar 17 '10 at 13:08 flow 4,2643295157 6 you are not showing all. Bash Error Redirection Null it cause original logfile is allways owerwritten. Ambiguous Redirect Bash Error no, do not subscribeyes, replies to my commentyes, all comments/replies instantlyhourly digestdaily digestweekly digest Or, you can subscribe without commenting.

Is my workplace warning for texting my boss's private phone at night justified? check over here 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 Another cool solution is about redirecting to both std-err/out AND to logger or log file at once which involves splitting "a stream" into two. The accepted answer do_something &>filename doesn't. +1. –Withheld Jan 4 '13 at 16:01 4 @Daniel, but this question is specifically about bash –John La Rooy Aug 19 '13 at 3:38 Bash Redirect Error Output To File

Notice that you should be pretty sure of what a command is doing if you are going to wipe it's output. The TARGET is not truncated before writing starts. 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 his comment is here Please explain the local library system in London, England Skeletal formula for carbon with two double bonds more hot questions question feed lang-sh about us tour help blog chat data legal

Appending redirected output N >> TARGET This redirects the file descriptor number N to the target TARGET. Bash Redirect Error To Stdout Reply Link Shyam November 18, 2015, 4:10 pmHi, Please tell me how to redirect the output from a script to a log file so that i can save all the details SyntaxDescription FILENAMEreferences a normal, ordinary filename from the filesystem (which can of course be a FIFO, too.

echo -n . >&3 # Write a decimal point there.

How do I do that in Bash? Its also a spelling error if you meant $OUTPUT_RESULTS} –ghostdog74 Mar 17 '10 at 13:12 add a comment| 5 Answers 5 active oldest votes up vote 134 down vote accepted Bash Reply Link RudyD April 2, 2012, 12:47 pmGreetings! Bash Redirect Standard Error also check your spelling echo $AAAA" "$DDDD" "$MOL_TAG >> "${OUPUT_RESULTS}" eg of ambiguous redirect $ var="file with spaces" $ echo $AAAA" "$DDDD" "$MOL_TAG >> ${var} bash: ${var}: ambiguous redirect $ echo

exec 2>/dev/null # From this point on, all error messages are lost date= $(date) … exec 2>/some/log/file # From this point on, all error messages go to the specified file share|improve To prevent an fd from being inherited, close it. # Redirecting only stderr to a pipe. Changing STDOUT after STDERR had been redirected to STDOUT won't change STDERR. weblink Is the standard Canon 18-55 lens the same as 5 years ago?

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Chapter 20. foo(){ : } 2>&1 | tee foo.logOR#!/bin/bash # My script to do blah ... { command1 command2 } 2>&1 | tee script.log Share this tutorial on:TwitterFacebookGoogle+Download PDF version Found an error/typo Reply Link Matt Kukowski January 29, 2014, 6:33 pmIn pre-bash4 days you HAD to do it this way:cat file > file.txt 2>&1now with bash 4 and greater versions… you can still In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms

What does Sauron need with mithril? Do COB LEDs usually need electrically insulating from the heatsink? I'm not really sure what your original commandline was, this one doesn't even parse because it's waiting for more input. It's free: ©2000-2016 nixCraft.

exec 3>&- # Close fd 3. asked 3 years ago viewed 17389 times active 4 months ago Linked 0 redirect all errors of my script into errors.txt Related 2redirecting std output and std error6Can redirecting stdout and Changing FD #1 doesn't affect FD #3 from now on. The redirection-operator << is used together with a tag TAG that's used to mark the end of input later: # display help cat <

How does the pilot control the Dassault Rafale? no longer refers to the exit status of do_something, but the exit status of tee. –Flimm Jan 20 '15 at 14:09 | show 3 more comments up vote 124 down vote Privacy - Terms of Service - Questions or Comments ≡ MenuHomeAboutLinux Shell Scripting TutoriaLRSS/FeednixCraftLinux and Unix tutorials for new and seasoned sysadmin.Linux Redirect Error Output To File by Vivek Gite on Join them; it only takes a minute: Sign up How to redirect both stdout and stderr to a file up vote 158 down vote favorite 44 Hi I am running a

I/O RedirectionTable of Contents20.1. This site is not affiliated with Linus Torvalds or The Open Group in any way. To avoid seeing the error message, put the whole command inside a group and redirect the error stream from the whole group: { date= $(date); } 2>/dev/null With braces, the command The shell's error stream is not redirected at this point.

Bash and other modern shell provides I/O redirection facility. Were slings used for throwing hand grenades? 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 You have to swap the order to make it do what you want: { echo OUTPUT; echo ERRORS >&2; } 1>/dev/null 2>&1 Examples How to make a program quiet (assuming all

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