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Launching a program or an other script (also mentioned above) means create an new process with all it's costs. It depends. When in doubt, I use 2>/dev/null. jack, 2012/03/02 17:41 Many thanks for these explanations! this contact form

We will assume that we run this command in a terminal. As with >, < can be used to open a new file descriptor for reading, command 3

Bash Redirect Error Output To File

read -n 4 <&3 # Read only 4 characters. command1 | command2 | command3 > output-file See Example 16-31 and Example A-14.

Multiple output streams may be redirected to one file. Is there a way to make a metal sword resistant to lava?

Reply Link iamfrankenstein June 12, 2014, 8:35 pmI really love: "command2>&1 | tee logfile.txt"because tee log's everything and prints to stdout . This might be useful to have optical nice code also when using here-documents. 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 Bash Redirect Stderr And Stdout To Same File 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

I can imagine that you can hack something with process substitution, but I'm not sure. Bash Redirect Error Output To /dev/null The position on the commandline does not really matter, a redirection (here document) is a redirection: # cat the two files plus "hello world" from standard input by here document redirection Consider it a simplified type of file pointer. Just something to keep in mind.

Thanks! –Guðmundur H Mar 12 '09 at 9:34 I tend to forget that... Bash Redirect Stderr And Stdout To Different Files I have learned a great deal about redirection. So the input of the while loop never "sees" the "enter choice:" prompt, since there is no newline. That something written on the file descriptor 2 will go where file descriptor 1 goes.

Bash Redirect Error Output To /dev/null

They will look like: --- +-----------------------+ standard input ( 0 ) ---->| /dev/pts/5 | --- +-----------------------+ --- +-----------------------+ standard output ( 1 ) ---->| file | --- +-----------------------+ --- +-----------------------+ standard First we type the command in our terminal, the descriptors look like this: --- +-----------------------+ standard input ( 0 ) ---->| /dev/pts/5 | --- +-----------------------+ --- +-----------------------+ standard output ( 1 Bash Redirect Error Output To File 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 Bash Redirect Standard Error command < input-file > output-file # Or the equivalent: < input-file command > output-file # Although this is non-standard.

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-output-and-error-to-file.html 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 What does an 'ü' mean? 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 Bash Redirect Stderr To Dev Null

exec 3>&- #we don't need 3 any more I've seen some people using this as a way to discard, say stderr, using something like: command 2>&-. If you use other solutions, such as alias debug=">&2 echo" or put >&2 ahead of echo, when you run test.sh > /dev/null, you will get nothing output!. Best leave this particular fd alone.

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Jan Schampera, 2011/02/14 06:31 These are 2 cases. Bash Redirect Stderr To Variable The problem is not present in the here-string facility. Is the empty set homeomorphic to itself?

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The TARGET is truncated before writing starts. Are there any 'smart' ejection seats? echo -n . >&3 # Write a decimal point there. Bash Redirect Stderr Pipe 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

You have to swap the order to make it do what you want: { echo OUTPUT; echo ERRORS >&2; } 1>/dev/null 2>&1 Examples How to make a program quiet (assuming all Check your preferred UNIX®-FAQ for details, I'm too lazy to explain what a terminal is Both, stdout and stderr are output file descriptors. 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 http://waspsoft.com/bash-redirect/bash-redirect-error-to-output.html We will see later why we might want other file descriptors.