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Bash Script Error Output To File

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The second part of the problem is that the bash built-in "read" returns on a newline or the option of N chars or delimiter X –neither of which would be useful Religious supervisor wants to thank god in the acknowledgements Activate Hearthstone season chest cards? For example, with Bash running in a Linux terminal emulator, you'll see: # lsof +f g -ap $BASHPID -d 0,1,2 COMMAND PID USER FD TYPE FILE-FLAG DEVICE SIZE/OFF NODE NAME bash Put '2>&1' after '>file.log' and it works. –Lars Wirzenius Mar 12 '09 at 9:25 1 Good point, I seem to have been doing this wrong all these years... this contact form

It's difficult to tell where the redirects are and whether they're even valid redirects. # This is in fact one command with one argument, an assignment, and three redirects. OR read more like this:BASH Shell Redirect Output and Errors To /dev/nullBASH Shell: How To Redirect stderr To stdout ( redirect stderr to a File )Unix and Linux: Redirect Error Output Browse other questions tagged bash shell redirect pipe or ask your own question. 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

Redirect Output Error To File

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>&-. For opening additional files, there remain descriptors 3 to 9. exec 3>&1 1>logfile 2>&1 echo "Hello World" ls filedoesnotexist exec 1>&3 echo "my message" | tee -a logfile ls filedoesnotexistyet exec 1>>logfile echo "Hello again" ls filestilldoesnotexist exit results in the

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  • Plase add this example, http://stackoverflow.com/questions/3141738/duplicating-stdout-to-stderr.
  • as you can see.

It's equivalent to > TARGET 2>&1 Since Bash4, there's &>>TARGET, which is equivalent to >> TARGET 2>&1. Why? Thanks Josef, 2012/03/23 01:26 How can I identify, which stream is connected to terminal and which is connected to somewhere else? Shell Script Output File 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

Redirecting output and error output &> TARGET >& TARGET This special syntax redirects both, stdout and stderr to the specified target. Bash Script Output To File And Console Reply Link Security: Are you a robot or human?Please enable JavaScript to submit this form.Cancel replyLeave a Comment Name Email Comment You can use these HTML tags and attributes: share|improve this answer edited Mar 12 '09 at 9:33 answered Mar 12 '09 at 9:17 Guðmundur H 4,82621519 add a comment| up vote 19 down vote Curiously, this works: yourcommand &> Reply Link Henry April 14, 2010, 4:53 pmhow does one redirect output from text file processing to a script file that uses the command line variable $1.file iplist has a long

I was looking for it around here and didn't find it. Batch Script Output File The classic redirection operator (command > file) only redirects standard output, so standard error is still shown on the terminal. use: command 2>&1 1>/dev/null Reply Link nixCraft October 6, 2011, 12:54 amNo, it does not matters. Why can a Gnome grapple a Goliath?

Bash Script Output To File And Console

If the op is < then there is an implicit 0, if it's > or >>, there is an implicit 1. I'm very lost with this. Redirect Output Error To File The word WORD is taken for the input redirection: cat <<< "Hello world... $NAME is here..." Just beware to quote the WORD if it contains spaces. Bash Script Output To File And Screen There are 3 default standard files (standard streams) open: [a] stdin - Use to get input (keyboard) i.e.

Let us see how to duplicate them, starting with the classic 2>&1. weblink These are the file descriptors of the inner {}. Can I log both the stderr and stdout logged to a file? Outside the whole construct you collect your original standard output (descriptor 3) and your original standard error output (descriptor 1 - through tee) to the normal descriptors (1 and 2), the Bash Script Input File

Use the long form >foo 2>&1. (see: obsolete) # Good! In the same way, command 2> file will change the standard error and will make it point to file. This is clearly a simple commmand with two arguments and 4 redirections cmd arg1 arg2 /dev/null >&2 # Good! { cmd1 <<<'my input'; cmd2; } >someFile # Bad. navigate here If you write a script that outputs error messages, please make sure you follow this convention!

All rights reserved. Bash Script Redirect Stderr To Dev Null So sayeth the Shepherd Convince people not to share their password with trusted others Did Donald Trump call Alicia Machado "Miss Piggy" and "Miss Housekeeping"? I can imagine that you can hack something with process substitution, but I'm not sure.

It seems that here-documents (tested on versions 1.14.7, 2.05b and 3.1.17) are correctly terminated when there is an EOF before the end-of-here-document tag.

Bash reads (stdin) from this terminal and prints via stdout and stderr to this terminal. --- +-----------------------+ standard input ( 0 ) ---->| /dev/pts/5 | --- +-----------------------+ --- +-----------------------+ standard output The output from stdout and stderr should go to a file, to see the scripts progress at the terminal I wanted to redirect the output of some echo commands to the What will command 3> file do? Bash Script Redirect Stderr To Variable The tag you use must be the only word in the line, to be recognized as end-of-here-document marker.

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. Though the OS will probably clean up the mess, it is perhaps a good idea to close the file descriptors you open. Why? his comment is here Later we will see how this can be useful.

Limit involving exponentials and arctangent without L'Hôpital Symbolic comparison of recursive functions A simple visual puzzle to die for Problem with using pause and onslide in one frame How does the Try this: declare tT="A\nB\nC\n" # Should have three lines here echo -e "tT($tT)" # Three lines, confirmed echo -e "sort($(sort <<< $tT))" # Sort outputs three lines echo -e "$tT" | typedeaF, 2011/08/15 17:35 I am looking to implement the features of Expect, with bash. Should be: yourcommand &>filename (redirects both stdout and stderr to filename).

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 Reply Link Security: Are you a robot or human?Please enable JavaScript to submit this form.Cancel replyLeave a Comment Name Email Comment You can use these HTML tags and attributes: no wonder I get all those emails from cron. Skeletal formula for carbon with two double bonds Video displays in Star Wars How to extrude a face parallel to another?

Wiki syntax is allowed: Please fill all the letters into the box to prove you're human. 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 So stderr goes to the stdout and that goes to the file. Redirecting Code Blocks20.3.

Lcet's go inside and have a look at the right part of the first pipe: | cmd2 2>&3 3>&- --- +-------------+ ( 0 ) ---->| 1st pipe | --- +-------------+ --- ls -yz 2>&1 >> command.log # Outputs an error message, but does not write to file. # More precisely, the command output (in this case, null) #+ writes to the file, Tony, 2012/02/10 01:41 Hello, Many thanks for the comprehensive tutorial. Force Microsoft Word to NEVER auto-capitalize the name of my company Meaning of "soul-sapping" How to pluralize "State of the Union" without an additional noun?

Reply Link xuhui November 24, 2014, 1:19 pmUseful for me!!!!