How to redirect the Shell Program output to file and Screen in Unix

Tee Unix Command to redirect the shell output to file and Screen

The tee utility will copy standard input to standard output, making a copy in zero or more files.
For more information "man tee"
Sample
#!/bin/sh
test="welcome to the world of linux"
echo $test | test Sample.txt // Here output will be redirected to Screen and Sample.txt
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