/usr/bin/tee

Usage: /usr/bin/tee [OPTION]... [FILE]...
Copy standard input to each FILE, and also to standard output.

  -a, --append
         append to the given FILEs, do not overwrite
  -i, --ignore-interrupts
         ignore interrupt signals
  -p
         operate in a more appropriate MODE with pipes
      --output-error[=MODE]
         set behavior on write error.  See MODE below
      --help
         display this help and exit
      --version
         output version information and exit

MODE determines behavior with write errors on the outputs:
  warn           diagnose errors writing to any output
  warn-nopipe    diagnose errors writing to any output not a pipe
  exit           exit on error writing to any output
  exit-nopipe    exit on error writing to any output not a pipe
The default MODE for the -p option is 'warn-nopipe'.
With "nopipe" MODEs, exit immediately if all outputs become broken pipes.
The default operation when --output-error is not specified, is to
exit immediately on error writing to a pipe, and diagnose errors
writing to non pipe outputs.

Report bugs to: <bug-coreutils@gnu.org>.
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Full documentation <https://www.gnu.org/software/coreutils/tee>
or available locally via: info '(coreutils) tee invocation'