you can try stdbuf $ stdbuf –output=L ./a | tee output.txt (big) part of the man page: -i, –input=MODE adjust standard input stream buffering -o, –output=MODE adjust standard output stream buffering -e, –error=MODE adjust standard error stream buffering If MODE is ‘L’ the corresponding stream will be line buffered. This option is invalid with standard … Read more
I had this same issue before and found this snippet very useful: class Tee(object): def __init__(self, name, mode): self.file = open(name, mode) self.stdout = sys.stdout sys.stdout = self def __del__(self): sys.stdout = self.stdout self.file.close() def write(self, data): self.file.write(data) self.stdout.write(data) def flush(self): self.file.flush() from: http://mail.python.org/pipermail/python-list/2007-May/438106.html
You can set the pipefail shell option option on to get the behavior you want. From the Bash Reference Manual: The exit status of a pipeline is the exit status of the last command in the pipeline, unless the pipefail option is enabled (see The Set Builtin). If pipefail is enabled, the pipeline’s return status … Read more
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”
I’m assuming you want to still see standard error and standard output on the terminal. You could go for Josh Kelley’s answer, but I find keeping a tail around in the background which outputs your log file very hackish and cludgy. Notice how you need to keep an extra file descriptor and do cleanup afterward … Read more