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Redirecting Unix Output Error

is connected to the terminal keyboard and standard output and error to the terminal screen. The way of indicating an end-of-file on the default standard input, a terminal, is usually . linux redirect stderr and stdout to file Redirection of I/O, for example to a file, is accomplished by specifying the bash redirect stdout and stderr to dev null destination on the command line using a redirection metacharacter followed by the desired destination. C Shell Family Some of the bash redirect stderr to dev null forms of redirection for the C shell family are: Character Action > Redirect standard output >& Redirect standard output and standard error < Redirect standard input >! Redirect standard output; overwrite file if

Ambiguous Output Redirect

it exists >&! Redirect standard output and standard error; overwrite file if it exists | Redirect standard output to another command (pipe) >> Append standard output >>& Append standard output and standard error The form of a command with standard input and output redirection is: % command -[options] [arguments] < input file > output file If you are using csh and do not have the noclobber variable csh redirect stderr set, using > and >& to redirect output will overwrite any existing file of that name. Setting noclobber prevents this. Using >! and >&! always forces the file to be overwritten. Use >> and >>& to append output to existing files. Redirection may fail under some circumstances: 1) if you have the variable noclobber set and you attempt to redirect output to an existing file without forcing an overwrite, 2) if you redirect output to a file you don't have write access to, and 3) if you redirect output to a directory. Examples: % who > names Redirect standard output to a file named names % (pwd; ls -l) > out Redirect output of both commands to a file named out % pwd; ls -l > out Redirect output of ls command only to a file named out Input redirection can be useful, for example, if you have written a FORTRAN program which expects input from the terminal but you want it to read from a file. 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 > m

updated March 12, 2008 in BASH Shell, Linux, UNIX Q. How do I redirect stderr to stdout? How do I redirect stderr to a file? A. Bash and other modern shell provides I/O redirection facility. bash write to stderr There are 3 default standard files (standard streams) open: [a] stdin - Use to get

Redirect Stdout And Stderr To File Windows

input (keyboard) i.e. data going into a program.

[b] stdout - Use to write information (screen) [c] stderr - Use to write

Bash Script Output To File

error message (screen) Understanding I/O streams numbers The Unix / Linux standard I/O streams with numbers: Handle Name Description 0 stdin Standard input 1 stdout Standard output 2 stderr Standard error Redirecting the standard error stream to a http://sc.tamu.edu/help/general/unix/redirection.html file The following will redirect program error message to a file called error.log: $ program-name 2> error.log
$ command1 2> error.log Redirecting the standard error (stderr) and stdout to file Use the following syntax: $ command-name &>file OR $ command > file-name 2>&1 Another useful example: # find /usr/home -name .profile 2>&1 | more Redirect stderr to stdout Use the command as follows: $ command-name 2>&1 Share this tutorial on:TwitterFacebookGoogle+Download PDF version Found an error/typo http://www.cyberciti.biz/faq/redirecting-stderr-to-stdout/ on this page?About the author: Vivek Gite is a seasoned sysadmin and a trainer for the Linux/Unix & shell scripting. Follow him on Twitter. 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 Error Output To null CommandPrinting output of c program to a file in LinuxUnix / Linux: Save Output To FilePython Run External Command And Get Output On Screen or In VariablePython Execute Unix / Linux Command ExamplesLinux / Unix Find Command: Avoid Permission Denied MessagesHow to gzip and keep original file on Unix or Linux command line { 11 comments… add one } Sayed Ahmad February 12, 2012, 12:11 am What this mean? $ command > file-name 2>&1 Reply Link Hesham M January 22, 2014, 3:34 pm This means redirect stdout to file-name, with that in mind redirect stderr t stdout. This will lead to both stderr and stdout go to file-name. Reply Link Shane Hathaway February 24, 2012, 1:02 am Sayed: that line means execute the command while redirecting both stdout and stderr to a file given by file-name. Reply Link RudyD April 2, 2012, 12:47 pm Greetings! A slightly more correct is: The output of the ‘command' is redirected to a ‘file-name' and the error chanel (that is the

>20.3. Applications

There are always three default files [1] open, stdin (the keyboard), stdout (the screen), and stderr (error messages output to the http://www.tldp.org/LDP/abs/html/io-redirection.html screen). These, and any other open files, can be redirected. Redirection simply means capturing output from a file, command, program, script, or even code block within a script (see Example 3-1 http://unix.stackexchange.com/questions/79996/how-to-redirect-stdout-and-stderr-to-a-file-and-display-stderr-to-console and Example 3-2) and sending it as input to another file, command, program, or script.

Each open file gets assigned a file descriptor. [2] The file descriptors for redirect stderr stdin, stdout, and stderr are 0, 1, and 2, respectively. For opening additional files, there remain descriptors 3 to 9. It is sometimes useful to assign one of these additional file descriptors to stdin, stdout, or stderr as a temporary duplicate link. [3] This simplifies restoration to normal after complex redirection and reshuffling (see Example 20-1).

COMMAND_OUTPUT > # Redirect stdout to a file. # Creates the file if not present, otherwise overwrites it. ls -lR > dir-tree.list # Creates a file containing a listing of the directory tree. : > filename # The > truncates file "filename" to zero length. # If file not present, creates zero-length file (same effect as 'touch'). # The : serves as a dummy placeholder, producing no output. > filename # The > truncates file "filename" to zero length. # If file not present, creates zero-length file (same effect as 'touch'). # (Same result as ": >", above, but this does not work with some shells.) COMMAND_OUTPUT >> # Redirect stdout to a file. # Creates the file if not present, otherwise appends to it. # Single-line redirection commands (affect only the line they are on): # -------------------------------------------------------------------- 1>filename # Redirect stdout to file "filename." 1>>filename # Redirect and append stdout to file "filename." 2>filename # Redirect stderr to file "filename." 2>>filename # Redirect and append stderr to file "filename." &>filename # Redirect both stdout and stderr to file "filename." # This operator is now functional, as of Bash 4,

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to redirect stdout and stderr to a file and display stderr to console? up vote 14 down vote favorite 3 I know how to redirect to a file, and use tee; on a basic level. So $ alias outanderr='bash -c "echo stdout >&1; echo stderr >&2"' # A fake "application" displaying both output and error messages. $ outanderr 1>file # redirect stdout to a file, display stderr stderr $ outanderr 2>file # redirect stderr to a file, display stdout stdout $ outanderr 1>file 2>&1 # redirect both to a file, display nothing $ outanderr | tee file; echo "-- file contents --" && cat file # redirect stdout to a file, display both (note: order is messed up) stderr stdout -- file contents -- stdout $ outanderr 2>&1 | tee file; echo "-- file contents --" && cat file # redirect both to a file, display both stdout stderr -- file contents -- stdout stderr The question is: what to write in place of the questionmarks to get the output below: $ outanderr ???; echo "-- file contents --" && cat file # redirect both to a file, display stderr stderr -- file contents -- stdout stderr Constaints: Assuming bash. The order should be kept in the file. stderr contents are displayed in real time line by line, i.e. no buffering. Separate script files can be used. Magic may be necessary. bash files io-redirection share|improve this question edited May 1 '14 at 21:12 asked Jun 19 '13 at 14:39 TWiStErRob 173117 How much control of the outanderr program do you have? –Kevin Jun 19 '13 at 15:02 1 @Kevin I think the question is more generic than that. Here, outanderr is just an alias that prints a line to stdout and another to stderr. The idea (if it's possible) is to build a generic solution that could work with any program, without modifying them. –lgeorget Jun 19 '13 at 15:06 @lgeorget I understand that, but I don't believe it is possible to strictly meet all constraints in a generic solution, so I was seeing if we could get a specific one. –Kevin Jun 19 '13 at 15:10 @Igeorget is right. &ndash

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