使用MacBook时，请参考下面的代码片段;

zsh:

echo 'export PATH="$HOME/.composer/vendor/bin:$PATH"' >>  ~/.zshrc
source ~/.zshrc

Bash的:

echo 'export PATH="$HOME/.composer/vendor/bin:$PATH"' >> ~/.bashrc
source ~/.bashrc

对于zsh和bash:

export PATH="$HOME/.config/composer/vendor/bin:$PATH"

source ~/.zshrc
source ~/.bashrc

仅针对bash:

export PATH=~/.config/composer/vendor/bin:$PATH

source ~/.bashrc

如果在mac上(想想*nix)，在你的终端上运行这个。

export PATH="~/.composer/vendor/bin:$PATH" 

解决方案链接http://tutsnare.com/laravel-command-not-found-ubuntu-mac/

在终端

# download installer
composer global require "laravel/installer=~1.1"
#setting up path
export PATH="~/.composer/vendor/bin:$PATH" 
# check laravel command
laravel 

# download installer
composer global require "laravel/installer=~1.1"

nano ~/.bashrc

#add

alias laravel='~/.composer/vendor/bin/laravel'

source ~/.bashrc

laravel

# going to html dir to create project there
cd /var/www/html/
# install project in blog dir.
laravel new blog

对于使用Linux和Zsh的用户:

1 -添加这一行到你的。zshrc文件

export PATH="$HOME/.config/composer/vendor/bin:$PATH"

2 -跑

source ~/.zshrc

Linux下“composer”文件夹路径与Mac不同 在Zsh路径中使用$HOME而不是~ .zshrc文件隐藏在Home文件夹中 export PATH=导出带引号的路径，这样Laravel可执行文件就可以被你的系统定位 $PATH是为了避免覆盖系统路径中已经存在的内容

如果你是2021年来到这里，这也适用于我使用Ubuntu 16.04

nano ~/.bash_profile 
export PATH=$HOME/.config/composer/vendor/bin:$PATH
ctrl+x and save 
source ~/.bash_profile