How to Redirect Output to Privileged Files Using sudo on Ubuntu

This guide explains why a simple sudo command may still produce a Permission denied error when redirecting output to a file you lack write access to, and presents four practical methods—including running a shell with sudo, using scripts, sudo -s, and sudo tee—to successfully write to such protected files on Ubuntu 18.04.

LinuxShellSudo

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How to Redirect Output to Privileged Files Using sudo on Ubuntu