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Bash Redirect Error Messages


My bash version: [email protected]:~/tmp$ bash --version GNU bash, version 4.2.24(1)-release (i686-pc-linux-gnu) So, where am I going wrong. 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 To prevent an fd from being inherited, close it. # Redirecting only stderr to a pipe. You da man! –Ogre Psalm33 Aug 4 '10 at 12:54 7 On AIX (ksh) your solution works. navigate here

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. The first operation is the 2>&1, which means 'connect stderr to the file descriptor that stdout is currently going to'. There are 3 default standard files (standard streams) open: [a] stdin - Use to get input (keyboard) i.e. Useful for daemonizing.

Bash Redirect Error Output To File

OR read more like this:How do I save or redirect stdout and stderr into different files?Linux Redirect Error Output To FileBASH Shell Redirect Output and Errors To /dev/nullUnix and Linux: Redirect Test something before commenting. –Ken Sharp Dec 21 '14 at 15:56 3 „If ‘|&’ is used, the standard error of command1 is connected to command2’s standard input through the pipe; How would family relationships change if legal system uses collective punishment? At that stage, you're not redirecting stderr anywhere.

If you write date= $(date) 2>/dev/null, the “command not found” message comes from the shell, not from the command whose error stream is redirected. LOGFILE=script.log echo "This statement is sent to the log file, \"$LOGFILE\"." 1>$LOGFILE echo "This statement is appended to \"$LOGFILE\"." 1>>$LOGFILE echo "This statement is also appended to \"$LOGFILE\"." 1>>$LOGFILE echo "This For opening additional files, there remain descriptors 3 to 9. Bash Script Redirect Output share|improve this answer edited Dec 16 '11 at 14:57 Chadwick 8,69353461 answered Dec 16 '11 at 14:24 kccqzy 618515 add a comment| Your Answer draft saved draft discarded Sign up

Can a creature benefit from differently typed speed bonuses all named fast movement? Bash Redirect Error Output To /dev/null How would family relationships change if legal system uses collective punishment? Should be: yourcommand &>filename (redirects both stdout and stderr to filename). 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:

Therefore you'll still see the error message. Bash Shell Redirect Output It's free: ©2000-2016 nixCraft. This is important because since the pipe was set up first, the FD1 (left side) and FD0 (right side) are already changed from what they might normally have been, and any 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 /dev/null

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, echo 1234567890 > File # Write string to "File". Bash Redirect Error Output To File Is it? –Salman Abbas Jul 11 '12 at 1:10 7 According to wiki.bash-hackers.org/scripting/obsolete, it seems to be obsolete in the sense that it is not part of POSIX, but the Bash Redirect Error To Variable Join them; it only takes a minute: Sign up With bash, how can I pipe standard error into another process?

Please explain the local library system in London, England Is this safe to display MySQL query error in webpage if something went wrong? check over here Is there any way to do this? How do I store and redirect output from the computer screen to a file on a Linux or Unix-like systems? but not for every stiuation. Bash Redirect Error To Stdout

It does appear to be working on my machine which runs Gnu bash v3.2.48. –James Wald Apr 10 '14 at 7:32 5 @CostiCiudatu the &>> operator does not seem to Yes, of course I'm an adult! What could cause the throttle to stick in my Ford Ranger? his comment is here Follow him on Twitter.

The accepted answer do_something &>filename doesn't. +1. –Withheld Jan 4 '13 at 16:01 4 @Daniel, but this question is specifically about bash –John La Rooy Aug 19 '13 at 3:38 Bash Redirect Output To File Append I'm very lost with this. For opening additional files, there remain descriptors 3 to 9.

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

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 asked 6 years ago viewed 196725 times active 4 months ago Linked 48 How can I redirect STDERR to STDOUT, but ignore the original STDOUT? 22 Shell: redirect stdout to /dev/null Good way to explain fundamental theorem of arithmetic? Bash Redirect Output To Stderr cat File # ==> 1234.67890 # Random access, by golly. | # Pipe. # General purpose process and command chaining tool. # Similar to ">", but more general in effect.

Best leave this particular fd alone.

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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 # The other is to append. A. I am aware of <() and $() process and command substitution respectively but not of {}. –ronnie Oct 20 '12 at 6:54 add a comment| Your Answer draft saved draft

Then, execute ‘command' and redirect its STDOUT to ‘file-name'" - keeping in mind that at this point STDOUT will also contain whatever is written to STDERR because of the earlier redirection. Therefore, when you type something like the following: command 2>&1 >/dev/null | grep 'something' Here is what happens, in order: a pipe (fifo) is created. "command FD1" is pointed to this Both ways are 'logrotateable'. All rights reserved.

in the first example you wrote: exec 1<>$LOG_FILE . What does an 'ü' mean? 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 Supplementary info to the question shouldn't be removed, especially in a 6 month old answer. –Jeff Ferland Sep 1 '09 at 14:14 13 This syntax is deprecated according to the

These, and any other open files, can be redirected. All output that "command" writes to its FD 1 (stdout) makes its way to /dev/null.