How to append the output to a file?
Solution 1:
Use >> to append:
command >> file
Solution 2:
Yeah.
command >> file to redirect just stdout of command.
command >> file 2>&1 to redirect stdout and stderr to the file (works in bash, zsh)
And if you need to use sudo, remember that just
sudo command >> /file/requiring/sudo/privileges does not work, as privilege elevation applies to command but not shell redirection part. However, simply using
tee solves the problem:
command | sudo tee -a /file/requiring/sudo/privileges