thanks! –wasatchwizard Apr 4 '13 at 17:55 1 @wasatchwizard Ithink I had trouble with that, but >NUL 2>NUL worked fine –FrinkTheBrave Aug 4 '14 at 8:24 4 If there The way of indicating an end-of-file on the default standard input, a terminal, is usually
Changing FD #1 doesn't affect FD #3 from now on. Faria 3861618 add a comment| 1 Answer 1 active oldest votes up vote 12 down vote accepted There are two main output streams in Linux (and other OSs), standard output (stdout)and bad_command3 # Error message echoed to stderr, #+ and does not appear in $ERRORFILE. # These redirection commands also automatically "reset" after each line. #=======================================================================http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html
Some of the forms of redirection for the Bourne shell family are: Character Action > Redirect standard output 2> Redirect standard error 2>&1 Redirect standard error to standard output < Redirect The example shows redirection of standard error only: $ who 2> /dev/null To redirect standard error and output to different files (note that grouping is not necessary in Bourne shell): $ 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 Both ways are 'logrotateable'.
How do I do that in Bash? Browse other questions tagged bash shell redirect pipe or ask your own question. In order to redirect STDERR you have to specify "2>" for the redirection symbol. Redirect Standard Error To Standard Output Tenant claims they paid rent in cash and that it was stolen from a mailbox.
In the following example, myprog, which was written to read standard input and write standard output, is redirected to read myin and write myout: % myprog < myin > myout You her latest blog I strongly suspect this has got to do with the way "cmd" parses commands that gives two different meanings depending on the order in which you specify the redirection. Redirect Standard Error To Standard Out Windows REM *** WARNING: THIS WILL NOT REDIRECT STDERR TO STDOUT **** dir 2>&1 > a.txt share|improve this answer edited Oct 9 '15 at 19:40 Peter Mortensen 10.2k1369107 answered May 23 '13 Redirect Standard Out To Standard Error Python 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.
However if you want them separated you can use the following: (command > stdoutfile) >& stderrfile ...as indicated the above will redirect stdout to stdoutfile and stderr to stderrfile. see here When you redirect console output using the ">" symbol, you are only redirecting STDOUT. That still does not explain it imho. –MarioDS Nov 3 '15 at 12:04 @MDeSchaepmeester, if you do dir 2>&1 > a.txt, you're first redirecting (>) stream 2 (stderr) to 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 Redirect Standard Out To Standard Error In Linux
This is suitable sometimes for cron entries, if you want a command to pass in absolute silence.
rm -f $(find / -name core) &> /dev/nullThis (thinking on the csh DOES have this capability and here is how it's done: xxx |& some_exec # will pipe merged output to your some_exec or xxx |& cat > filename or if you What am I? http://completeprogrammer.net/standard-error/difference-between-standard-error-standard-deviation-confidence-interval.html For example, 2> redirects file descriptor 2, or standard error. &n is the syntax for redirecting to a specific open file.
First, create an executable echo_err that will write a string to stderr: #include
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LOGFILE=script.log echo "This statement is sent to the log file, \"$LOGFILE\"." 1>$LOGFILE echo "This statement is appended to \"$LOGFILE\"." 1>>$LOGFILE echo "This statement is also appended to \"$LOGFILE\"." 1>>$LOGFILE echo "This Can I use half-lap joint for table breadboard? 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>&-. Linux Pipe Standard Error Movie about a guy who uses a notebook to relive and fix horrible accidents that he and his friends caused more hot questions question feed about us tour help blog chat
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 Note: The order matters as liw.fi pointed out, 2>&1 1>file.log doesn't work. Physically locating the server What is the next big step in Monero's future? http://completeprogrammer.net/standard-error/difference-between-standard-error-and-standard-deviation-in-excel.html 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) ...
The latter can be done with either the first part of my answer or this answer but there is no way for csh to do the former. When you run this script with: ./test.csh >test.out 2>test.err (the initial redirection is set up by bash before csh starts running the script), and examine the out/err files, you see: test.out: