linux下有命令行wget命令，利用它我们可以使用命令便捷地安装各种软件。 mac系统，我们可以先安装brew，安装wget，然后就可以像在linux下一样使用wget命令了。
brew的官网https://brew.sh/
安装brew
mac系统自带ruby，使用如下命令安装brew。
代码语言：javascript复制ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)”
HEAD is now at 8f43d6b9f Merge pull request #3267 from reitermarkus/refactoring
==> Downloading https://homebrew.bintray.com/bottles-portable/portable-ruby-2.3.3.leopard_64.bottle.1.tar.gz
######################################################################## 100.0%
==> Pouring portable-ruby-2.3.3.leopard_64.bottle.1.tar.gz
==> Tapping homebrew/core
Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core'...
remote: Counting objects: 4596, done.
remote: Compressing objects: 100% (4383/4383), done.
remote: Total 4596 (delta 30), reused 339 (delta 6), pack-reused 0
Receiving objects: 100% (4596/4596), 3.83 MiB | 20.00 KiB/s, done.
Resolving deltas: 100% (30/30), done.
Tapped 4374 formulae (4,643 files, 11.9MB)
==> Cleaning up /Library/Caches/Homebrew...
==> Migrating /Library/Caches/Homebrew to /Users/byronyy/Library/Caches/Homebrew...
==> Deleting /Library/Caches/Homebrew...
Already up-to-date.
==> Installation successful!
==> Homebrew has enabled anonymous aggregate user behaviour analytics.
Read the analytics documentation (and how to opt-out) here:
https://docs.brew.sh/Analytics.html
==> Next steps:
- Run `brew help` to get started
- Further documentation:
https://docs.brew.sh安装wget
代码语言：javascript复制brew install wget
byronyys-MBP:~ byronyy$ brew install wget
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
blahtexml dbxml enigma opensaml pktanon xalan-c xerces-c xml-security-c xml-tooling-c xqilla xsd zorba
==> Installing dependencies for wget: openssl@1.1
==> Installing wget dependency: openssl@1.1
==> Downloading https://homebrew.bintray.com/bottles/openssl@1.1-1.1.0f.sierra.bottle.tar.gz
####################### 33.3%安装mysql
brew install mysql
