brew install mtr macOS10.15

##homebrewでmtrを導入したらパスが通っていなかったメモ
結論だけ知りたい方は、まとめ参照

homebrewでmtrをインストール

% brew install mtr
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🍺  /usr/local/Cellar/mtr/0.94
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.

8.8.8.8に向けてmtrを実行したが、mtrがないらしい

% sudo mtr 8.8.8.8
Password:
sudo: mtr: command not found

パスを見てみると、/usr/local/Cellar/mtr/0.94らしい。

~ % brew link mtr
Warning: Already linked: /usr/local/Cellar/mtr/0.94
To relink:
  brew unlink mtr && brew link mtr

中身を見てみると、それっぽいのがない

% ls /usr/local/Cellar/mtr/0.94
AUTHORS			INSTALL_RECEIPT.json	README.md		sbin
COPYING			NEWS			TODO			share

こっちにあった。

% ls /usr/local/Cellar/mtr/0.94/sbin
mtr		mtr-packet

リンク作成①

% ln /usr/local/Cellar/mtr/0.94/sbin/mtr /usr/local/bin/mtr

再度実行すると、mtr-packetもいるらしい

% sudo mtr 8.8.8.8
mtr: Failure to start mtr-packet: Invalid argument

リンク作成②

% ln /usr/local/Cellar/mtr/0.94/sbin/mtr-packet /usr/local/bin/mtr-packet

もっかい実行、動いた

                               My traceroute  [v0.94]
xxxxx-MacBook-Pro.local (172.31.xxx.xxx) -> 8.8.8.8        2020-10-15T23:41:13+0900
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                            Packets               Pings
 Host                                     Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 172.31.xxx.xxx                         0.0%     5    1.7   3.3   1.7   9.4   3.4
 2. 10.255.xxx.xxx                         0.0%     5    2.0   3.2   1.9   8.0   2.7
 3. xxxxxxxxxxxxxxx.ppp-bb.dion.ne.jp      0.0%     5    4.2   3.8   3.4   4.2   0.3
 4. xxxxxxxxxxxx.bb.kddi.ne.jp             0.0%     5    6.4   5.5   5.0   6.4   0.5
 5. xxxxxxxxx.bb.kddi.ne.jp                0.0%     5   16.5   8.3   5.1  16.5   4.7
 6. 27.85.xxx.xx                           0.0%     5    9.3   9.8   7.1  17.1   4.2
 7. 27.85.xxx.xx                           0.0%     5    9.7   8.4   6.2  13.3   3.1
 8. 72.14.xxx.xx                           0.0%     5    7.1   9.5   6.2  13.9   3.5
 9. 209.85.xxx.xx                          0.0%     5    5.7   6.4   5.7   7.7   0.8
10. 72.14.xxx.xxx                          0.0%     4    5.9   8.5   5.9  12.9   3.2
11. dns.google                             0.0%     4    6.3   6.7   5.7   8.0   1.0                                                                                                                                       

##まとめ

% brew install mtr
% ln /usr/local/Cellar/mtr/0.94/sbin/mtr /usr/local/bin/mtr
% ln /usr/local/Cellar/mtr/0.94/sbin/mtr-packet /usr/local/bin/mtr-packet

以上