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Bash Redirect Standard Error To Standard Output


I could redirect stderr into stdout if I wanted to capture both. Thanks Jan Schampera, 2012/03/23 16:56 Using the test command on the file descriptors in question. [ -t 0 ] # STDIN [ -t 1 ] # STDOUT ... BTW setting IFS='' did not work. –John Mark Mitchell Apr 13 at 19:53 @gniourf_gniourf The article Bash: Preserving Whitespace Using set and eval has me wondering if whitespace preservation You can mimic such a command with a function: banana() { echo "banana to stdout" echo >&2 "banana to stderr" } I'll assume you want standard output of banana in variable this contact form

up vote 91 down vote favorite 20 I know this much: $ command 2>> error $ command 1>> output Is there any way I can output the stderr to the error Does mean=mode imply a symmetric distribution? Why does Windows show "This device can perform faster" notification if I connect it clumsily? 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.

Bash Redirect Standard Output To File

Fwiw, looks like command &2>err.log isn't quite legit -- the ampersand in that syntax is used for file descriptor as target, eg command 1>&2 would reroute stdout to stderr. –DreadPirateShawn Sep Each redirection causes the file descriptors to be "remapped" by closing the "source" and duplicating the "destination" into it (see the man pages of dup(2) and close(2)), in order. The order is important! 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

How to deal with a really persuasive character? more hot questions lang-sh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Other Simply everything you can reference in the filesystem) &Nreferences the current target/source of the filedescriptor N ("duplicates" the filedescriptor) &-closes the redirected filedescriptor, useful instead of > /dev/null constructs (> &-) Bash Redirect Stdout To File And Screen To be precise, the following substitutions and expansions are performed in the here-document data: Parameter expansion Command substitution Arithmetic expansion You can avoid that by quoting the tag: cat <<"EOF" This

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 spectral norm of block-wise sums of matrices Why did companions have such high social standing? What are the canonical white spaces? If N is omitted, stdout is assumed (FD 1).

It just confuses people, you are right. Bash Redirect Stdout And Stderr To Different Files 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 Next, I tried to pass in a command via variable and have it working with ls "foo" but am having issues with ls "foo bar" -- note the space in the What does an 'ü' mean?

Bash Redirect Output To Stdout And File

I'll call your command banana. You can try it yourself: c() { echo >&2 'to stderr'; echo 'to stdout'; }; error=$( { result=$(c); } 2>&1); echo "result: $result"; echo "error: $error". Bash Redirect Standard Output To File There are two incorrect concepts in your answer.First is: the redirection happens from left to right. Bash Redirect To Dev Null ERRORFILE=script.errors bad_command1 2>$ERRORFILE # Error message sent to $ERRORFILE.

The here-string will append a newline (\n) to the data. weblink 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 How do I redirect stderr to stdout? It is analogous to a file handle in C.

[3]Using file descriptor 5 might cause problems. Bash Redirect Stdout To One File And Stderr To Another

You can also use 1 instead of 2 so that stdout gets redirected to the 'file' share|improve this answer answered Sep 24 '11 at 5:53 PaulDaviesC 512822 add a comment| Your Any file descriptor can be redirected to other file descriptor or file by using operator > or >>(append). You da man! –Ogre Psalm33 Aug 4 '10 at 12:54 7 On AIX (ksh) your solution works. navigate here Join them; it only takes a minute: Sign up How to redirect stderr and stdout to different files in the same line of bash?

At this point, you'll have on your terminal screen: declare -- bout="banana to stdout" declare -- berr="banana to stderr" with the line declare -- bout="banana to stdout" being displayed via stderr. Bash Redirect Stdout And Stderr To Same File This syntax is deprecated and should not be used. Changing FD #1 doesn't affect FD #3 from now on.

So, this one won't do cmd 2>&1 | grep pattern because it will mix the original STDOUT and STDERR.

When taking passengers, what should I do to prepare them? exec 3>&1 4>&2 1> >(tee >(logger -i -t 'my_script_tag') >&3) 2> >(tee >(logger -i -t 'my_script_tag') >&4) trap 'cleanup' INT QUIT TERM EXIT get_pids_of_ppid() { local ppid="$1" RETVAL='' local pids=`ps x If N is omitted, stdout is assumed (FD 1). Bash Redirect Stdout To Stdin This answer is misleading because what will happen is not what is expected or asked for. –Dom Aug 28 '14 at 9:34 1 Hi I've changed the commands, it should

Whereas, > will overwrite any existing data in the file. Best leave this particular fd alone.

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There are always three default files [1] open, stdin (the keyboard), stdout (the screen), and stderr (error messages output http://waspsoft.com/bash-redirect/bash-redirect-standard-output-and-error.html I prefer separate files which require less parsing but as I said, whatever makes your boat floating :) –quizac Dec 8 '14 at 11:02 how do you switch back

Success! command1 | command2 | command3 > output-file See Example 16-31 and Example A-14.

Multiple output streams may be redirected to one file. Reply Link TodorMinchev May 14, 2013, 9:03 pmRudyD +1 :) Reply Link Daniel August 26, 2013, 7:22 pmActually it means "first redirect STDERR to STDOUT, so any errors printed out on share|improve this answer edited May 31 at 8:44 answered Feb 4 at 13:57 reim 894 It creates file "-" on my Ubuntu box(GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu) ) –Tamerlaha

Using exec20.2. Join them; it only takes a minute: Sign up How can I redirect STDERR to STDOUT, but ignore the original STDOUT? [duplicate] up vote 48 down vote favorite 15 This question Under normal circumstances, there are 3 files open, accessible by the file descriptors 0, 1 and 2, all connected to your terminal: NameFDDescription stdin0standard input stream (e.g. What works: Therefore, to obtain the desired effect, you just need to reverse the redirections.