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The redirection applies only to the program itself. I also know that I could do ./useless.sh 2> /tmp/Error ERROR=`cat /tmp/Error` but that's ugly and unnecessary. Is the standard Canon 18-55 lens the same as 5 years ago? Browse other questions tagged bash . this contact form

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Bash Redirect Stdout And Stderr To Variable

After checking this, I know I won't make this mistake again. –Stephan Oct 11 '12 at 14:34 @Stephan cheers, this has also been discussed here. :) –Shadow Wizard Oct How to pluralize "State of the Union" without an additional noun? It could also be written 1>&33>&-.

On THE other hand or on another hand? after running the command: 1 command 2 status=$? Join them; it only takes a minute: Sign up Bash script - store stderr in variable [duplicate] up vote 28 down vote favorite 9 This question already has an answer here: Bash Redirect Output To Variable asked 6 years ago viewed 31530 times active 5 years ago Linked 88 How to store standard error in a variable in a Bash script 15 Bash how do you capture

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

Multiple output streams may be redirected to one file. Bash Catch Stderr Why? ret=`{ ./segfault; } 2>&1` The form ret=`eval ./segfault 2>&1` applies the redirection to the whole evaluation of the eval command, so in principle it should work, and it does in fact Leffler, but I'll add that you can call useless from inside a Bash function for improved readability: #!/bin/bash function useless { /tmp/useless.sh | sed 's/Output/Useless/' } ERROR=$(useless) echo $ERROR All other

Tweet Follow @IvordeCom You might also be interested in: bash: -bash: output: cannot overwrite existing file. Bash Redirect Error Output To File Then 2>&3 redirects stderr to file number 3, which now is the same as stdout. In my example, the of commands is only "ls".Code:# ls file.txt nonexist.txtls: nonexist.txt: No such file or directoryfile.txtfile.txt exists and nonexist.txt doesn't.Following ERROR variable will take the value of the standard bash stderr share|improve this question edited Jun 18 '12 at 16:57 Tim Pote 13.4k23344 asked Jun 18 '12 at 16:55 stackoverflow 4,0212380143 marked as duplicate by tripleeebash Users with the bash

Bash Catch Stderr

Browse other questions tagged bash stderr or ask your own question. more hot questions question feed 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 Bash Redirect Stdout And Stderr To Variable Thanks! –thornate Jun 28 '10 at 8:02 @AdamCrume how would i change this script so that in log file I will have both stderr & stdout ( out \n Shell Capture Stderr Do COB LEDs usually need electrically insulating from the heatsink?

Do you simply want to view it on the console? weblink grep foo somelogfile | head -5; then 3 printf "uh oh\n" 4 fi Now, some trickier stuff. unfortunately, whenever I wrap STDIN inside >( ) with something in $() in an attempt to capture that to a variable, I lose the contents of $(). If you want to capture the output, you use command substitution: 1 output=$(command) # stdout only; stderr remains uncaptured 2 output=$(command 2>&1) # both stdout and stderr will be captured 3 Bash Redirect To Variable Filename

  • Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the
  • I've found solutions to redirect stderr to stdout, but I can't do that as the stdout is already being sent (via gzip) to a file.
  • What the script writes to FD 1 (normally stdout) will be written to stderr because of the first and third redirections.
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  • Well, that depends on whether you want to store the command's output (either stdout, or stdout + stderr) or its exit status (0 to 255, with 0 typically meaning "success").
  • Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the
  • Last edited by lavascript; 04-17-2009 at 07:38 AM..
  • I want to continue using stdout, so redirecting stderr into stdout is not helpful, in this case.
  • See my changes. –Tim Pote Jun 18 '12 at 17:08 add a comment| Not the answer you're looking for?

share|improve this answer answered Aug 9 '15 at 21:31 Scott 11.5k112650 add a comment| You must log in to answer this question. Why? asked 7 years ago viewed 102312 times active 10 months ago Linked 28 Bash script - store stderr in variable 0 Store the output of command in variable in unix 0 navigate here Skipping directly to level 4 Do COB LEDs usually need electrically insulating from the heatsink?

Browse other questions tagged bash shell redirect variables stderr or ask your own question. Bash Redirect Error Output To /dev/null stderr is captured. 3 exec 3>&- # Close FD #3. 4 5 # Or this alternative, which captures stderr, letting stdout through: 6 { output=$(command 2>&1 1>&3-) ;} 3>&1 In the Applications

There are always three default files [1] open, stdin (the keyboard), stdout (the screen), and stderr (error messages output

Problem?

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

Edit: Updated the command to redirect stderr from the mysqldump command and not gzip, I was too quick in my first answer. If those answers do not fully address your question, please ask a new question. 2 This StackOverflow thread should answer your question. –Web User Jun 18 '12 at 16:57 Why are some programming languages Turing complete but lack some abilities of other languages? http://waspsoft.com/bash-redirect/bash-error-redirect.html Redirection simply means capturing output from a file, command, program, script, or even code block within a script (see Example 3-1 and Example 3-2) and sending it as input

Is the following extension of finite state automata studied? ERRORFILE=script.errors bad_command1 2>$ERRORFILE # Error message sent to $ERRORFILE. It would be more efficient for process 1 to recycle itself.