Duplicate output without tee

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tee

tee(1)							      General Commands Manual							    tee(1)

NAME

       tee - pipe fitting to copy standard output to file

SYNOPSIS

       [file]...

DESCRIPTION

       The command transcribes the standard input to the standard output and makes copies in the files.

   Options
	      This option ignores interrupts.

	      This option appends the output to the
			files rather than overwriting the files.

EXTERNAL INFLUENCES

   Environment Variables
       determines the language in which messages are displayed.

       If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari-
       able.  If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of

       If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are  set  to	"C".   See
       environ(5).

   International Code Set Support
       Single- and multibyte character code sets are supported.

RETURN VALUE

       The command returns zero upon successful completion, or nonzero if the command fails.

EXAMPLES

       Write a list of users to the screen and also append the list to the file

STANDARDS CONFORMANCE

																	    tee(1)

Shell Programming and Scripting