How do I unset a variable in the fish shell?

Question

In bash I can unset a variable with ``` unset myvar ``` In fish I get ``` fish: Unknown command 'unset' ``` What's the equivalent for unset in fish.

Accepted Answer

Fish uses options on the `set` command to manipulate shell variables.

Unset a variable with the `-e` or `--erase` option.

```
set -e myvar 
```

Additionally you can define a function

```
function unset
  set --erase $argv
end

funcsave unset
```

or an abbreviation

```
abbr --add unset 'set --erase'
```

or an alias in `~/.config/fish/config.fish`

```
alias unset 'set --erase'
```

Solution