tee - read from standard input and write to standard output and files
tee [OPTION]... [FILE]...
Copy standard input to each FILE, and also to standard output.
append to the given FILEs, do not overwrite
ignore interrupt signals
--help display this help and exit
output version information and exit
If a FILE is -, copy again to standard output.
Written by Mike Parker, Richard M. Stallman, and David MacKenzie.
Report tee bugs to firstname.lastname@example.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report tee translation bugs to <http://translationproject.org/team/>
Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
The full documentation for tee is maintained as a Texinfo manual. If the info and tee programs are properly installed at your site, the command
info coreutils 'tee invocation'
should give you access to the complete manual.