Linux添加路径到PATH||env

• env

  A list of all the current environmental variables and their values for the current user, including all the directories in the PATH variable, can be seen by running the env command without any options or arguements.

• PATH

  PATH is an environmental variable in Linux and other Unix-like OS that tells the shell which directories to search for executable files in response to commands issued by a user.

  env | grep PATH
  echo $PATH
  

• Change PATH

  PATH variables can be changed relatively easily. They can be changed just for the current login session, or they can be changed permanently.

  • current login session change

    PATH="/usr/sbin:$PATH"
    
    PATH = $PATH:/usr/sbin
    export PATH
    
    export PATH=$PATH:/usr/sbin