Output text from a command to the screen and save it to a file in Unix

You can use the tee command to output text from a command both to the screen and to a file. The tee command takes data from standard input and writes it to standard output as well as to a file.

For example, without the tee command, you would be forced to redirect the output of the who command to a file, and then print the file to the screen with two separate commands. In other words, to redirect the output of the who command to the file who_output and then print it to the screen, you would have to type the following two commands:

who > who_output
cat who_output

However, using the tee command, you can shorten the above process as follows:

who | tee who_output

For more information about the tee command, see the online manual. At your Unix shell prompt, enter:

man tee