何為 PATH？

PATH 路徑是環(huán)境變量，和 Windows 系統(tǒng)類似，是可執(zhí)行命令文件的存放路徑。

當(dāng)你在命令行輸入一個 ls 命令時，系統(tǒng)會在當(dāng)前工作目錄以及 PATH 的路徑中依次尋找，找到的話執(zhí)行，找不到的話返回 command not found: ls。

PATH 路徑可以通過 echo $PATH 查看，

或者 env|grep PATH。

修改 PATH

添加

• 臨時添加 usr/local/bin

  直接在終端輸入命令 PATH=$PATH:/usr/local/bin

  更改在當(dāng)前會話有效，退出本次會話后則失效

• 永久添加 usr/local/bin

  修改 .bashrc 文件

  添加一句：export PATH=$PATH:/usr/local/bin

刪除

• 臨時刪除

  直接在終端輸入命令 PATH=... ...為除去不想要的路徑的其他所有路徑

• 永久刪除

  • 將上面的臨時命令放入 .bashrc 中：echo PATH=...
    或者在 .bashrc 文件末尾添加以下代碼：

  ### remove unnecessary Win PATHs
  # This can prevent extension-less commands from bleeding into BASH.
  # (eg. "ng" would execute the Win bin if "@angular/cli" wasn't installed on Linux.)
  #
  function path_remove {
    # Delete path by parts so we can never accidentally remove sub paths
    PATH=${PATH//":$1:"/":"} # delete any instances in the middle
    PATH=${PATH/#"$1:"/} # delete any instance at the beginning
    PATH=${PATH/%":$1"/} # delete any instance in the at the end
  }
  
  path_remove '/mnt/c/Users/me/AppData/Roaming/npm'
  path_remove '/mnt/c/Users/me/AppData/Local/Yarn/bin'
  path_remove '/mnt/c/Program Files (x86)/Yarn/bin'
  path_remove '/mnt/c/Program Files/Git'
  path_remove '/mnt/c/Program Files/Git/cmd'
  path_remove '/mnt/c/Program Files/nodejs'
  path_remove '/mnt/c/OpenSSL-Win32/bin'
  path_remove '/mnt/c/Program Files (x86)/Python27'