How to redirect output to a file and stdout

Question

In bash, calling foo would display any output from that command on the stdout.

Calling foo > output would redirect any output from that command to the file specified (in this case 'output').

Is there a way to redirect output to a file and have it display on stdout?

Answer 1

The command you want is named tee

ls -lR / | tee output.file

Answer 2

'tail -f output' should work.

Answer 3

tee is perfect for this, but this will also do the job

ls -lr / > output | cat output