If you want a plug-in free solution, you can try the following: $ exec bash -c ‘source script.sh; exec fish’ This has some caveats and won’t work in all c

If you want a plug-in free solution, you can try the following: $ exec bash -c ‘source script.sh; exec fish’ This has some caveats and won’t work in all cases (both bass and replay.fish go into more detail), but this is what I use and it hasn’t failed me yet.