waspsoft.com


Home > Bash Redirect > Bash Redirecting Standard Output And Standard Error

Bash Redirecting Standard Output And Standard Error

Contents

How to make different social classes look quite different? How to book a flight if my passport doesn't state my gender? Changing FD #1 doesn't affect FD #3 from now on. This site is not affiliated with Linus Torvalds or The Open Group in any way. this contact form

in the first example you wrote: exec 1<>$LOG_FILE . 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 echo -n . >&3 # Write a decimal point there. Otherwise the rest will be given as normal parameters.

Bash Redirect Stderr To Stdout

for real loggin better way is: exec 1>>$LOG_FILE it cause log is allways appended. –Znik Dec 8 '14 at 9:43 2 That's true although it depends on intentions. and what is the sequence of the backend execution of the command? Changing STDOUT after STDERR had been redirected to STDOUT won't change STDERR. share|improve this answer edited Oct 27 '15 at 10:33 rubenvb 41.5k13103186 answered Mar 12 '09 at 9:16 Marko 17.8k125999 3 I was searching SO for how to do this with

  • 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
  • Can filling up a 75 gallon water heater tank without opening a faucet cause damage?
  • bash stdout stderr share|improve this question edited Sep 23 '11 at 10:11 asked Sep 23 '11 at 9:35 sdmythos_gr 1,59621321 2 possible duplicate of Redirect stderr and stdout in a

bash stdout stderr piping share|improve this question edited Jul 13 at 19:08 asked May 11 '13 at 12:55 Andrew Ferrier 4,76712454 marked as duplicate by tripleeebash Users with the bash badge Please try the request again. How to book a flight if my passport doesn't state my gender? Bash Redirect Stderr To Stdout Tee Avoid referencing file descriptors above 9, since you may collide with file descriptors Bash uses internally.

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 Privacy - Terms of Service - Questions or Comments current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. 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 If you have to use operands (e.g.

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 Bash Redirect Stdout And Stderr To Different Files bad_command3 # Error message echoed to stderr, #+ and does not appear in $ERRORFILE. # These redirection commands also automatically "reset" after each line. #=======================================================================

(cmd1) >(cmd2) ... The redirection operators are checked whenever a simple command is about to be executed.

Bash Redirect Stderr To Stdout To File

My approach is to always create a unique and timestamped log file. My girlfriend has mentioned disowning her 14 y/o transgender daughter more hot questions question feed lang-sh about us tour help blog chat data legal privacy policy work here advertising info mobile Bash Redirect Stderr To Stdout UNIX is a registered trademark of The Open Group. Bash Redirect Stderr To Stdout To Dev Null Since you redirect stdout to the file first, the redirection of stderr inherits that redirection.

no, do not subscribeyes, replies to my commentyes, all comments/replies instantlyhourly digestdaily digestweekly digest Or, you can subscribe without commenting. weblink You can even combine sudo to downgrade to a log user account and add date's subject and store it in a default log directory :) Reply Link Alejandro April 22, 2015, You can read more about redirection here. If N is omitted, stdout is assumed (FD 1). Bash Redirect Stderr To Stdout In Script

A little note for seeing this things: with the less command you can view both stdout (which will remain on the buffer) and the stderr that will be printed on the The man page does specify a preference for '&>' over '>&', which is otherwise equivalent. –chepner Jul 16 '12 at 20:45 6 I guess we should not use &> as UNIX is a registered trademark of The Open Group. http://waspsoft.com/bash-redirect/bash-redirecting-standard-error-to-standard-out.html as you can see.

Consider it a simplified type of file pointer. Bash Redirect Stdout And Stderr To Same File 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 # I was looking for it around here and didn't find it.

The result of running a script having the above line and additionally this one: echo "Will end up in STDOUT(terminal) and /var/log/messages" ...is as follows: $ ./my_script Will end up in

It will make STDERR point to STDOUT and then change STDOUT to something else (without touching STDERR) Here is a more detailed tutorial covering both those misconceptions http://wiki.bash-hackers.org/howto/redirection_tutorial Reply Link iek The word after the <<< is expanded (variables, command substitutions, ...), but not pathname-expanded (*.txt, foo??.exe, ...), so: # this gives the contents of PATH variable cat <<< "$PATH" # this It is analogous to a file handle in C.

[3]Using file descriptor 5 might cause problems. Bash Redirect Stdout And Stderr Append To File If you just need to redirect in/out of a command you call from your script, the answers are already given.

A simple visual puzzle to die for Force Microsoft Word to NEVER auto-capitalize the name of my company Do COB LEDs usually need electrically insulating from the heatsink? Browse other questions tagged bash io-redirection stdout stderr or ask your own question. 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 his comment is here 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

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. 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