How to reload aliases added in ~/.cshrc without reboot FreeBSD 11.3

You can just run logout and then log in again, no need for full reboot.

As an alternative, simply run csh inside existing shell.

I think you should be able to just do source ~/.cshrc. Alternatively, you can just type the line adding alias directly into csh. (e.g. alias ll ls -l).

However, please note that these will only work for the shell which you source'd in, but not other parallel instances. In other words, you will need to do it in every shell you want to use the alias.

Hope this helps.