Whenever I issue a command after installing plugin, I get the grep usage guide output in addition to the output of the command.

[EvanRosenliebNREL]

Strange I know, not sure how else to explain other than to show:

Please let me know what other information that I can provide that would help.

[evantravers]

I'm getting this as well. It appears to be the -oP argument in the grep command on this line: https://github.com/fishgretel/fasd/blob/master/conf.d/__fasd_run.fish#L2

When I change it to -o, it works without showing the error.