@BeAware here you go:
```
sed -i "s#note_length: { maximum: 500#note_length: { maximum: 800#g" $WDIR/app/models/account.rb
sed -i "s#input_html: { maxlength: 500#input_html: { maxlength: 800#g" $WDIR/app/views/settings/profiles/show.html.haml
```
Set $WDIR to the folder where Mastodon is installed.