As the title states, how to reload aliases added in
~/.cshrc without rebooting FreeBSD 11.3?
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.