如何在macOS使用wget

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在macOS中安装wget的过程并非一帆风顺，本文作者通过homebrew安装时遇到错误，需要修改目录权限，之后又因缺少xcode而安装xcode，经过多次尝试，最终成功运行wget，但仍有待研究的提示。

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面对命令行操作，我从来没有随随便便成功过。今天记录一下我是如何艰难安装wget的。
首先借助homebrew，尝试安装wget

$ brew install wget

一番操作后，果然出现了error，如下：

Error: The following directories are not writable by your user:
/usr/local/share/man/man5
/usr/local/share/man/man7

You should change the ownership of these directories to your user.
  sudo chown -R $(whoami) /usr/local/share/man/man5 /usr/local/share/man/man7

大意就是需要将上面两个目录的owner改为当前操作人。OK，按要求执行命令：

$  sudo chown -R $(whoami) /usr/local/share/man/man5 /usr/local/share/man/man7

然后再次运行：

$ brew install wget

好吧，没有谁能随随便便成功，又error了。

Error: Failed to download resource "openssl"
Download failed: https://homebrew.bintray.com/bottles/openssl-1.0.2q.mojave.bottle.tar.gz
Warning: Bottle installation failed: building from source.
Error: The following formula
  openssl
cannot be installed as binary package and must be built from source.
Install the Command Line Tools:
  xcode-select --install

按指令安装xcode

$ xcode-select --install

再次尝试

$ brew install wget

终于，成功运行。
还是有一些提示，含义待研究。

A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
  /usr/local/etc/openssl/certs

and run
  /usr/local/opt/openssl/bin/c_rehash

openssl is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.

If you need to have openssl first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

For compilers to find openssl you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl/include"

For pkg-config to find openssl you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig"