How to show output on terminal and save to a file at the same time?

Question

I am using:

user@unknown:~$ sudo command -option > log

to save the results of "command" to the file "log", but I'd like to also get the result on the terminal, is this possible?

I am using ubuntu 10.04 lts.

Answer 1

Use tee.

user@unknown:~$ sudo command -option | tee log

Answer 2

The command you're looking for is 'tee' which makes a data connection similar to a pipe-tee. it sends data two ways. So

sudo command -option | tee log

would tee the command output to both the file 'log' and to stdout, in this case, your terminal.

Answer 3

You can also use script [ http://linux.die.net/man/1/script ] to capture everything that occurs in your terminal session.

Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).