Display redirect output file

The correct version points stdout at the log file, then redirects stderr to stdout, so both stderr and stdout point at the log file. The wrong version points stderr at stdout which outputs to the shell , then redirects stdout to the file.

Another common use for redirecting output is redirecting only stderr. Peteris Krumins wrote an excellent blog post about bash redirection and goes into more detail on custom file descriptors. Whether you're a new founder, a large enterprise, or somewhere in between, we'll partner with you to bring digital products from validation to success and teach you how.

Learn more about how thoughtbot helps. If you're using OS X, it's marginally easier to use unbuffer in most cases, although not if you want to pass signals to the command you're running. My comment was more aimed at users who are on Linux, where coreutils is most likely installed by default. Ethan, see this answer if you're confused about stdbuf syntax: stackoverflow.

Note that python has a built in option -u that unbuffers output. Show 3 more comments. This method discards colored console output, any ideas? Community Bot 1 1 1 silver badge. Badr O. Badr 2, 2 2 gold badges 21 21 silver badges 30 30 bronze badges. Something to add Setting aside the troubles Following worked for me bash myscript. Using tail -f output should work. Arsen Khachaturyan 7, 4 4 gold badges 36 36 silver badges 38 38 bronze badges.

Chuck Phillips Chuck Phillips 1 1 gold badge 6 6 silver badges 15 15 bronze badges. You can do that for your entire script by using something like that at the beginning of your script :! Ugly but useful for me in certain situations. I want to print something by using "echo" on screen and append that echoed data to a file echo "hi there, Have to print this on screen and append to a file". Jackkobec Jackkobec 4, 25 25 silver badges 28 28 bronze badges.

Sumit Singh That's an error if output doesn't already exist and it doesn't do what you want if it does, overall it is nonsensical. Perhaps you meant ";" instead of " "? Asked 12 years, 8 months ago. Active 5 months ago. Viewed k times.

Edward Thomson Ammu Ammu. The similarities between cmd. None of these work if one has a console application that loads a dll that outputs text. The main application text gets redirected to a file but the output from the dll does not and continues to be displayed in the console window. I have found NO way to capture the text from the dll. What if i am using a command line utility and want to redirect the output to a file in the exact same format as displayed on screen i used youtube-dl to extract links and could redirect the output to a txt file , but its not formatted as you will get in the prompt , in the file its coming as single line.

Add a comment. Active Oldest Votes. To expand on davor's answer , you can use PowerShell like this: powershell "dir tee test. Community Bot 1 1 1 silver badge. Saxon Druce Saxon Druce This is the most close answer: it works on default install, as PS is already there on most machines and, especially, servers.

Consider adding '-Append' so the log file doesn't get truncated each command start. For example powershell "node server. Show 6 more comments. Christopher Painter This satisfies the answer, but outputs the data after the dir command has completed rather than as the data is produced.

I like this simple answer! LHC -- Only by using a utility like tee. There are various packages to get unlx-like or linux-like utilities that run on windows. There is no native Windows way. Brian Rasmussen Brian Rasmussen k 34 34 gold badges silver badges bronze badges. The link points to a Windows implementation of the Unix command tee, so it does work on Windows. Yeah, voting up the answer and the comment. I'd actually prefer CygWin since it has everything but some people prefer non-DLL tools that they can pick and choose.

Lots of Unix utilities are also ported by GnuWin32 project, see gnuwin UnxUtils was last updated in ; GnuWin32 is a bit more up-to-date. If you, like me, struggled to find GnuWin32's tee package, you'll find it in gnuwin Show 4 more comments. Check this out: wintee No need for cygwin. I did encounter and report some issues though. Davor Josipovic Davor Josipovic 4, 1 1 gold badge 34 34 silver badges 52 52 bronze badges. Why the down vote? UNIX utility tee outputs real time.

Thumbs up! This should be the accepted answer. Brian Webster Andy Welch Andy Welch 4 4 silver badges 2 2 bronze badges. This is useful when there was some form of error in your command and you still want to see the log file on the console.

See Microsoft's article on this. Unfortunately there is no such thing. Zombo 1. Daniel Rikowski Daniel Rikowski 68k 56 56 gold badges silver badges bronze badges. A simple C console application would do the trick: using System; using System.

Generic; using System. Add new StreamWriter file ; outputs. Add Console. ReadBlock buffer, 0, buffer. So if you use. Now, if you want to save this error message into a file, you need to redirect the stderr into a file like,. This option allows to discard error messages. Foe example. Next, both the stdout and stderr can be redirected towards the same file.

For example. In either case the output will be in output. So, execute the above command in two ways: 1 when file. Now, the last thing is if you want to redirect stdout and stderr into the same file and append it to the existing contents of the target file.

The method will be:.