I'm not sure how to do a for loop using fish shell. I keep having to drop out of fish to run it in bash.

take this for example:

```
for i in $(cat subdomains); do curl $i | html2text >> websites

```

I get:

```
fish: $(...) is not supported. In fish, please use '(cat)'.
for i in $(cat subdomains); do curl $i | html2text >> websites
         ^

```