The C99 standard does not specify if the three standard streams are unbuffered or line buffered: It is up to the implementation. All UNIX implementations I know have a line buffered stdin. On Linux, stdout in line buffered and stderr unbuffered. As far as I know, POSIX does not impose additional restrictions. POSIX’s fflush page … Read more
Since Python 3.7 you can change the encoding of standard streams with reconfigure(): sys.stdout.reconfigure(encoding=’utf-8′) You can also modify how encoding errors are handled by adding an errors parameter.
Try stdbuf, included in GNU coreutils and thus virtually any Linux distro. This sets the buffer length for input, output and error to zero: stdbuf -i0 -o0 -e0 command
To expand on davor’s answer, you can use PowerShell like this: powershell “dir | tee test.txt” If you’re trying to redirect the output of an exe in the current directory, you need to use .\ on the filename, eg: powershell “.\something.exe | tee test.txt”
Take a look here. It should be: yourcommand &> filename It redirects both standard output and standard error to file filename.
from cStringIO import StringIO # Python3 use: from io import StringIO import sys old_stdout = sys.stdout sys.stdout = mystdout = StringIO() # blah blah lots of code … sys.stdout = old_stdout # examine mystdout.getvalue()
The evaluation order of elements in an expression is unspecified (except some very particular cases, such as the && and || operators and the ternary operator, which introduce sequence points); so, it’s not guaranteed that test will be evaluated before or after foo(test) (which modifies it). If your code relies on a particular order of … Read more
The command you want is named tee: foo | tee output.file For example, if you only care about stdout: ls -a | tee output.file If you want to include stderr, do: program [arguments…] 2>&1 | tee outfile 2>&1 redirects channel 2 (stderr/standard error) into channel 1 (stdout/standard output), such that both is written as stdout. … Read more
The Python 3 Solution The print function accepts an end parameter which defaults to “\n”. Setting it to an empty string prevents it from issuing a new line at the end of the line. def install_xxx(): print(“Installing XXX… “, end=””, flush=True) install_xxx() print(“[DONE]”) Pyhton 2 Solution Putting a comma on the end of the print … Read more
First redirect stderr to stdout — the pipe; then redirect stdout to /dev/null (without changing where stderr is going): command 2>&1 >/dev/null | grep ‘something’ For the details of I/O redirection in all its variety, see the chapter on Redirections in the Bash reference manual. Note that the sequence of I/O redirections is interpreted left-to-right, … Read more