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Bash Redirect Standard Error To Standard Output


Rankin Sep 2 '14 at 2:04 1 Earlier comments are no longer relevant because the answer has fundamentally changed (for the better). This means that in your command standard output is first replaced with /dev/null, and then standard error replaced with standard output, which is /dev/null already. No help available yet for $PROGRAM. share|improve this answer edited Jun 16 '15 at 21:21 Neil 10k73448 answered Dec 10 '12 at 18:12 zb' 5,79612053 Thanks - accepting this answer because using file descriptors 3 his comment is here

Subscribed! why? Let's start from the innermost term: bout=$(banana) This is just the standard way to assign to bout the standard output of banana, the standard error being displayed on your terminal. Then: { bout=$(banana); } 2>&1 will still assign to bout the stdout of banana, but the stderr of banana is displayed on terminal via stdout (thanks to the redirection 2>&1.

Bash Redirect Standard Output To File

All about redirection 3.1 Theory and quick reference There are 3 file descriptors, stdin, stdout and stderr (std=standard). Reply Link Sekkuar September 2, 2013, 7:20 pmIncorrect. There's also a decent chance that the command will return an error status since there is diagnostic output, so the && will then not help. Based on this answer I'm using fd 3 to send extra information between two scripts, and capturing it from the calling script using { output=$(command 3>&1 1>&4-) ;} 4>&1 –Zim Mar

Mine is about redirecting within current script which affects all commands/built-ins(includes forks) after the mentioned code snippet. It is sometimes useful to assign one of these additional file descriptors to stdin, stdout, or stderr as a temporary duplicate link. [3] This simplifies restoration It's equivalent to > TARGET 2>&1 Since Bash4, there's &>>TARGET, which is equivalent to >> TARGET 2>&1. Bash Redirect Stdout To File And Screen Browse other questions tagged linux bash or ask your own question.

They're evaluated from left to right. The redirection-operator << is used together with a tag TAG that's used to mark the end of input later: # display help cat <

Problem with using pause and onslide in one frame Can Customs make me go back to return my electronic equipment or is it a scam? Bash Redirect Stdout And Stderr To Different Files How to pluralize "State of the Union" without an additional noun? And yes, during my research I found some weirdness in the Bash manual page about it, I will ask on the mailing list. 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

Bash Redirect Output To Stdout And File

What type of sequences are escape sequences starting with "\033]" I do not get any ether when mining How to pluralize "State of the Union" without an additional noun? local output="$( { local stdout stdout="$($*)" local exitcode=$? Bash Redirect Standard Output To File good explanation, I'd like to make a function on C that redirects STDIN and SDTOUT to an script, how can I do that, I mean, the exist a library's on C Bash Redirect To Dev Null I'll call your command banana.

local evaloutput=' { output [NR] = $0 } END \ { firstresultline = NR - output [NR - 1] - 1 if (Var == "error") \ { for (i = 1; http://onlinetvsoftware.net/bash-redirect/bash-redirect-standard-error-and-standard-out-to-file.php The position on the commandline does not really matter, a redirection (here document) is a redirection: # cat the two files plus "hello world" from standard input by here document redirection In practice, it could be a pipe, socket or whatever. Not the answer you're looking for? Bash Redirect Stdout To One File And Stderr To Another

For example: banana() { printf 'banana to stdout %d\n' {1..10} echo >&2 'banana to stderr' return 42 } . <({ berr=$({ mapfile -t bout < <(banana); } 2>&1; declare -p bout Why can a Gnome grapple a Goliath? asked 7 years ago viewed 28990 times active 4 years ago Get the weekly newsletter! http://onlinetvsoftware.net/bash-redirect/bash-redirect-standard-error-and-output.php exec 3>&- # Close fd 3.

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

Multiple output streams may be redirected to one file. Bash Redirect Stdout And Stderr To Same File Jul 13 at 13:29 This question has been asked before and already has an answer. I suggest removing this. –Jonathan Leffler Feb 14 '09 at 21:36 Also consider that the output may be very large, and with cat you will see the grep only

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

You da man! –Ogre Psalm33 Aug 4 '10 at 12:54 7 On AIX (ksh) your solution works. Dennis numbers 2.0 Convince people not to share their password with trusted others Verbs of buttons on websites Train ride from Copenhagen to Malmo Password Protected Wifi, page without HTTPS - 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 To Stdin You mentioned the return code of the command too.

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 Don't put commands into variables!. –gniourf_gniourf Apr 14 at 20:41 | show 5 more comments up vote 7 down vote You can do: OUT=$(myscript.sh 2> errFile) ERR=$(>$ERRORFILE # Error message appended to $ERRORFILE. http://onlinetvsoftware.net/bash-redirect/bash-redirect-standard-output-and-error.php Best leave this particular fd alone.

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Otherwise the rest will be given as normal parameters. Symbolic comparison of recursive functions How to extrude a face parallel to another? Can Customs make me go back to return my electronic equipment or is it a scam? So, command 2> error 1> output if you do not want to append.

i>&j # Redirects file descriptor i to j. # All output of file pointed to by i gets sent to file pointed to by j. >&j # Should indoor ripened tomatoes be used for sauce? The TARGET is truncated before writing starts. 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

cat *.txt | sort | uniq > result-file # Sorts the output of all the .txt files and deletes duplicate lines, # finally saves results to "result-file".&3 # Write a decimal point there.

It now discusses how to independently redirect outputs which is useful. –Dom Sep 10 '14 at 8:29 | show 1 more comment up vote -7 down vote Command 1 >> output1.txt; Join them; it only takes a minute: Sign up Redirect stderr and stdout in a Bash script up vote 364 down vote favorite 118 I want to redirect both stdout and It almost work, but not from xinted ;( share|improve this answer answered Apr 23 '09 at 13:14 log-control I'm guessing it doesn't work because of "/dev/fd/3 Permission denied". Both ways are 'logrotateable'.

SyntaxDescription FILENAMEreferences a normal, ordinary filename from the filesystem (which can of course be a FIFO, too. Can I log both the stderr and stdout logged to a file?