tee - pipe fitting (duplicate standard input)
tee [-ai] [file ...]
The tee(1) utility copies standard input to standard output, making a copy in zero or more files. The output is unbuffered.
The following options are available:
The file is a path name of an output file.
The tee(1) utility takes the default action for all signals, except in the event of the -i option.
The tee(1) utility exits 0 on success, and >0 if an error occurs.
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