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Bash Redirect Error To Output


Is the empty set homeomorphic to itself? asked 6 years ago viewed 207759 times active 20 days ago Visit Chat Linked -4 What does 1>&2 mean in shell? 6 Raise error in bash script 1 How to suppress However, your command doesn't work either. Join them; it only takes a minute: Sign up How can I redirect and append both stdout and stderr to a file with Bash? this contact form

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

Bash Redirect Error Output To File

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 Notice that you should be pretty sure of what a command is doing if you are going to wipe it's output. EOF As you see, substitutions are possible. It's also easier to read 'append output and errors to this file' than 'send errors to output, append output to this file'.

  • I was looking for it around here and didn't find it.
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  • Useful for daemonizing.
  • It's a mighty tool that, together with pipelines, makes the shell powerful.
  • but is there a way to make sense of this or should I treat this like an atomic bash construct? –flybywire May 18 '09 at 8:15 135 It's simple redirection,
  • The opner asks "is there any standard tool to output (pipe) to stderr", the schort answer is : NO ...
  • I'll simplify it and hope I interpreted it right: cat <
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  • Should be: yourcommand &>filename (redirects both stdout and stderr to filename).
  • ls -yz >> command.log 2>&1 # Capture result of illegal options "yz" in file "command.log." # Because stderr is redirected to the file, #+ any error messages will also be there.
  • share|improve this answer edited Dec 30 '13 at 20:12 Steven Penny 1 answered Jul 10 '12 at 21:24 Brandon Rhodes 35.3k874114 1 I am/was more thinking about loosing or getting This functionality is provided by 'tee' command which can write/append to several file descriptors(files, sockets, pipes, etc) at once: tee FILE1 FILE2 ... >(cmd1) >(cmd2) ... asked 7 years ago viewed 344714 times active 7 months ago Linked 463 Redirect all output to file 38 Linux (Bash): Redirect all output to file 1 Redirecting stdout and stderr Bash Redirect Stderr To Stdout Tee You can manually override that behaviour by forcing overwrite with the redirection operator >| instead of >.

    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. bad_command2 2>>$ERRORFILE # Error message appended to $ERRORFILE. I'm editing my answer to remove the first example. –Aaron R. Your version redirects err to out, and at the same time out to file. –Alex Yaroshevich Mar 8 '15 at 23:22 | show 1 more comment Your Answer draft saved

    how portable is it? –code_monk Jul 28 at 12:39 add a comment| up vote 6 down vote Don't use cat as some are mentioned here. Bash Redirect Stdout And Stderr To Different Files exec 1<>$LOG_FILE # Redirect STDERR to STDOUT exec 2>&1 echo "This line will appear in $LOG_FILE, not 'on screen'" Now, simple echo will write to $LOG_FILE. SyntaxDescription FILENAMEreferences a normal, ordinary filename from the filesystem (which can of course be a FIFO, too. ERRORFILE=script.errors bad_command1 2>$ERRORFILE # Error message sent to $ERRORFILE.

    Bash Redirect Error Output To /dev/null

    share|improve this answer edited Sep 11 at 15:16 answered Aug 29 at 1:50 osexp2003 63666 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign Consider it a simplified type of file pointer. Bash Redirect Error Output To File asked 5 years ago viewed 98630 times active 1 year ago Get the weekly newsletter! Bash Redirect Stderr To Stdout To File Take care.

    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 http://waspsoft.com/bash-redirect/bash-redirect-output-and-error-to-file.html Redirecting Code Blocks20.3. 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 How to deal with a very weak student? Bash Redirect Stderr To Stdout In Script

    I made the fix and added the post to community wiki –f3lix Mar 12 '09 at 9:49 3 If you want to append to a file then you must do Redirecting output and error output &> TARGET >& TARGET This special syntax redirects both, stdout and stderr to the specified target. echo 1234567890 > File # Write string to "File". navigate here I know I can do echo foo 1>&2 but it's kinda ugly and, I suspect, error prone (e.g.

    How does Gandalf get informed of Bilbo's 111st birthday party? Bash Redirect Stdout And Stderr To Same File cmd &>> file.txt did not work for me. 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

    To prevent an fd from being inherited, close it. # Redirecting only stderr to a pipe.

    And yes, during my research I found some weirdness in the Bash manual page about it, I will ask on the mailing list. 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 My home country claims I am a dual national of another country, the country in question does not. Bash Redirect Stdout And Stderr Append To File Not the answer you're looking for?

    OTOH it's not that big a deal. –BCS Jun 7 '10 at 14:42 6 @Mike DeSimone: If someone else messes with the code, shuffles around the output, and doesn't actually share|improve this answer answered Apr 23 '13 at 5:07 einstein6 192 add a comment| up vote 1 down vote "Easiest" way (bash4 only): ls * 2>&- 1>&-. error_handling filename="foobar.txt" config_error $filename "invalid value!" output_xml_error "No such account" debug_output "Skipping cache" log_error "Timeout downloading archive" notify_admin "Out of disk space!" fatal "failed to open logger!" And error_handling being: [email protected] http://waspsoft.com/bash-redirect/bash-redirect-error-output.html 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

    Camilo Martin's bash specific suggestion uses a "here string" and will print anything you pass to it, including arguments (-n) that echo would normally swallow: echoerr() { cat <<< "$@" 1>&2; Now, FDs #3 and #4 point to STDOUT and STDERR respectively. bash share|improve this question edited Aug 19 '14 at 22:36 Steven Penny 1 asked Jun 7 '10 at 14:36 BCS 25.4k41145245 add a comment| 13 Answers 13 active oldest votes up more likely to get edited wrong when things change).

    Multiple redirections More redirection operations can occur in a line of course. If N is omitted, stdout is assumed (FD 1).