You have probably already noticed my favorite way to overcome the sudo redirection issue, but if you haven’t, then I will write it down here for further reference.
Try, for example, to clear /etc/issue file as a regular user. You will encounter Permission denied error, which is expected behavior.
$ clear > /etc/issue bash: /etc/issue: Permission denied
You can’t just insert sudo at the beginning of the above-mentioned command as redirection will be performed with user rights.
$ sudo clear > /etc/issue bash: /etc/issue: Permission denied
To solve this issue, you can simply use tee command.
$ clear | sudo tee /etc/issue
Additional tee examples
Append additional configuration directive.
$ echo GRUB_RECORDFAIL_TIMEOUT=20 | sudo tee -a /etc/default/grub
Write a multi-line configuration.
$ cat << EOF | sudo tee /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp EOF
Write to multiple files.
$ echo "Linux at home" | sudo tee /etc/issue /etc/issue.net
Simply store command output.
$ make | sudo tee /root/make.log
Store compressed data and preview it in parallel.
$ sudo find . -type f -exec sha1sum {} \; | tee >(gzip > /tmp/sha1sum.gz) | vim -Store results depending on their state.
$ sudo netstat -tapn | tee >(grep LISTEN > tcp_listen.log) >(grep ESTABLISHED > tcp_established.log)
