To complement zett42’s helpful answer: If you’re running PowerShell (Core) 7+, you can pass the file path that represents the terminal (console) to the (positionally implied) -FilePath parameter (in Windows PowerShell, this causes an error, unfortunately – see bottom section): # PowerShell 7+ only # Windows Get-Content data.txt | Tee-Object \\.\CON | data_processor.exe # Unix-like … Read more
You could popen() the tee program. Or you can fork() and pipe stdout through a child process such as this (adapted from a real live program I wrote, so it works!): void tee(const char* fname) { int pipe_fd[2]; check(pipe(pipe_fd)); const pid_t pid = fork(); check(pid); if(!pid) { // our log child close(pipe_fd[1]); // Close unused … Read more
By using $() you are (effectively) creating a subshell. Thus the PIPESTATUS instance you need to look at is only available inside your subshell (i.e. inside the $()), since environment variables do not propagate from child to parent processes. You could do something like this: OUT=$( wget -q “http://budueba.com/net” | tee -a “file.txt”; exit ${PIPESTATUS[0]} … Read more
It should be ok if you use both tee and mkfifo. mkfifo pipe cat pipe | (command 1) & echo ‘test’ | tee pipe | (command 2)
I see that this is a rather old post but just in case someone is still searching for a way to do this: proc = subprocess.Popen([“ping”, “localhost”], stdout=subprocess.PIPE, stderr=subprocess.PIPE) with open(“logfile.txt”, “w”) as log_file: while proc.poll() is None: line = proc.stderr.readline() if line: print “err: ” + line.strip() log_file.write(line) line = proc.stdout.readline() if line: print … Read more
You do have the right design—if you want to do this purely within the stdlib. One thing: instead of teeing to each streambuf on every output, implement it to use the same put area as one of the streambufs it’s given, and copy to the others on overflow and sync. This will minimize virtual calls, … Read more
Duplicate &1 in your shell (in my examle to 5) and use &5 in the subshell (so that you will write to stdout (&1) of the parent shell): exec 5>&1 FF=$(echo aaa|tee >(cat – >&5)) echo $FF Will print aaa two times, ones because of the echo in the subshell, and second time print the … Read more
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
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