What is the easiest way to make sure a "field, or option" is present in a file. Similar to what ansible's lineinfile does? For example suppose I need to add th

What is the easiest way to make sure a "field, or option" is present in a file. Similar to what ansible's lineinfile does? For example suppose I need to add this setting to /etc/ssh/sshd_config: PermitRootLogin yes One idea that comes to mind is to first delete the line with the line shown in this post, and then add it back: Regex sed -E '/^#/d' file.txt - delete lines where regex matches sed -E '/^PermiteRootLogin/d' /etc/ssh/sshd_config ; echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config Is there a more straightforward way with sed?