Environment variables

Most common user variables:

$HOME
Points to the users' home directory

$PATH
Points to the directories the shell needs to look at to execute a command or script when you enter it in the command line

• $ export PATH=$HOME/bin:$PATH
  Adds the directory $HOME/bin
• $ echo $PATH
  Lists the directories $PATH points to

In this link the difference between

$ PAH=directory-path-1:directory-path-2:directory-path-3 (etc)

and

$ export PATH=directory-path:$PATH

$SHELL
Points to the user's default command shell

$PSI
Your current Prompt Statement. There are 4 PSs in total.
Guide to modify the $PSx

Commands

To show a list of the current variables:

• env
• set
• printenv