53.Variable_Scopes.md

Variable Scopes

1. Session Scope

   • Variables declared in the terminal are valid only during the session.
   • They are removed when the session ends.

   $ X=10  
   $ Y=20  

2. User Scope

   • Variables declared in the .bashrc file are available for all sessions of the current user.
   • These variables are inaccessible to other users.

Example .bashrc snippet:

export GUEST=Dhoni  
export FRIEND=Sej

3. System Scope
   • Variables accessible to all users and sessions.
   • Declared inside /etc/profile, requiring root permissions to edit.

Example /etc/profile snippet:

export NAME=DURGA  
export COURSE=PYTHON