Redirect all output to file?

Question

I know that in Linux, to redirect output from the screen to a file, I can either use the `>` or `tee`. However, I'm not sure why part of the output is still output to the screen and not written to the file. Is there a way to redirect all output to file?

Answer 1

# save everything, including errors, to a file

command &> output.log

# add to the end of the file instead of replacing it

command >> output.log 2>&1

# see the output on your screen and save it too

command 2>&1 | tee output.log