tee — stdin stdout - file -- opt --help --version
cat command, the
tee command copies standard input
to standard output unaltered. Simultaneously, however, it also
copies that same standard input to one or more files.
tee is most often found in the middle of
pipelines, writing some intermediate data to a file while also
passing it to the next command in the pipeline:
$ who | tee original_who | sort
In this command line,
writes the output of
who to the
original_who, and then passes
along that same output to the rest of the pipeline (
sort), producing sorted output on
Append instead of overwriting files.
Ignore interrupt signals.