In some situations, saving stdout and stderr of your terminal command output can be crucial, 
To automatically save stdout and stderr, there are several options you can go with

`>` : Write stdout outputs to file, stderr outputs to terminal.

$ command > output.txt

`2>` : Write stdout outputs to terminal, stderr outputs to file.

$ command 2> output.txt

`&>` : Both stdout and stderr outputs to file

$ command &> output.txt

`|& tee` : Both stdout and stderr outputs to file and terminal

$ command |& tee output.txt