macOS 安装mtr 和mtr: Failure to start mtr-packet: Invalid argument 错误的解决

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1.通过Homebrew安装mtr

brew install mtr

先出现一个错误提示：

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink sbin/mtr
Target /usr/local/sbin/mtr
already exists. You may want to remove it:
  rm '/usr/local/sbin/mtr'

To force the link and overwrite all conflicting files:
  brew link --overwrite mtr

To list all files that would be deleted:
  brew link --overwrite --dry-run mtr

==> Caveats
mtr requires root privileges so you will need to run `sudo mtr`.
You should be certain that you trust any software you grant root privileges.

那是因为以前装了旧版，按照提示运行如下命令再来一次

  brew link --overwrite mtr

然后出现如下提示：

Linking /usr/local/Cellar/mtr/0.92... 10 symlinks created

2. 尝试运行(注意要求sudo运行)：

sudo /usr/local/sbin/mtr  www.google.com

提示

mtr: Failure to start mtr-packet: Invalid argument

搜了一下，发现解决方法也很简单：

把usr/local/sbin/下面的 mtr 和 mtr-packet 复制到/usr/local/bin 下面即可。

再次运行没问题了。

sudo /usr/local/bin/mtr  www.google.com

因为以前装过旧版，我不知道是否需要创建alias也能直接省略路径，反正我这里直接用可以：

sudo mtr www.google.com

然后我用alias命令看了一下alias列表，里面并没有mtr相关内容。

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