When cap3 try to execute comands on my FreeBSD server - I have an errors and my cap3 tasks doesn't work

```
DEBUG [0bb99d53] Command: if test ! -d /home/web_server/data/www/capistrano/site/shared/dumps; then echo "Directory does not exist '/home/web_server/data/www/capistrano/site/shared/dumps'" 1>&2; false; fi
DEBUG [0bb99d53]    if: Expression Syntax.
DEBUG [0bb99d53]    fi: Command not found.

```

And I know why - because my server use csh shell by default

```
% echo $0
-csh

```

Following cap3 variable doesn't work for me

```
set :shell, '/usr/local/bin/bash'
set :default_shell, '/usr/local/bin/bash'

```

How can I set shell for cap3 tasks?