markdown 有关如何在Mac OS X上安装Fish shell的说明，包括Oh My Fish！。还包括几个有用的功能。

Posted 2021-05-06

# Installation

1. Install [fish](http://fishshell.com/) via [Brew](http://brew.sh/)
2. Optionally install [Oh My Fish!](https://github.com/oh-my-fish/oh-my-fish) 
3. Add fish to known shells
4. Set default shell to fish

```bash
brew install fish  
curl -L https://get.oh-my.fish | fish
sudo echo /usr/local/bin/fish >> /etc/shells
chsh -s /usr/local/bin/fish
```

# Functions

Add any the following functions to `~/.config/fish/config.fish`

### sudo bang bang

Repeat previous command with administrator rights

```
function sudo
    if test "$argv" = !!
        eval command sudo $history[1]
    else
        command sudo $argv
    end
end
```

### cd..

Shortcut to browse parent directory

```
function ..
    cd ..
end
```

And how often did you ever type `cd..` instead of `cd ..`? Let's extend our previous function:

```
function cd..
    cd ..
end
```
   
### dropbox

Quickly access your DropBox folder

```
function db
	set user $HOME
    cd "$HOME/Dropbox"
end
```

### docs

Quickly access your documents folder

```
function docs    
	switch (uname -s)
    case Darwin Linux FreeBSD NetBSD DragonFly
		set documents $HOME/Documents
	case '*'
		set cygwin (eval uname -o)  
    		if test $cygwin = "Cygwin"
    			set documents (eval cygpath -O)
    		end    
    		return
    	end    
    	cd $documents
    end
end
```

### os

Return platform name

```
function os
    switch (uname -s)
    case Darwin Linux FreeBSD NetBSD DragonFly
        eval command uname -s
    case "*"
    	switch (uname -s)
    	case Cygwin
    		eval command uname -s
    	case "*"
    		eval echo "undefined"
    	end
    end
end
```

### git tag

Simplify the creation and deletion of Git tags

```
function tag
	if test $argv[1] = "-d"
		# delete tag if provided
		if test $argv[2]
			eval command git tag -d $argv[2]
			command git push origin :refs/tags/$argv[2]
		end
	else
		# create new tag and push
    	eval command git tag -a $argv[1] -m $argv[1]
    	command git push --tags
    end
end
```